Leather Mold Killer Kit A3.mk by Leather Doctor® is a comprehensive fungicide system designed to clean, disinfect, sanitize, condition, deodorize, and kill mold on leather and suede surfaces.
Understanding Mold on Leather
Mold is a living microorganism identifiable by its characteristic musty odor and visible moldy patches.
It thrives on leather following water damage, exposure to alkaline cleaning products that destabilize leather’s natural acidic pH (3–5), surface soiling, and storage in humid conditions.
Unchecked mold growth degrades leather by drawing nutrients from its fibrous structure, weakening its tear strength, and, in severe cases, leaving unsightly dark pits that may require physical removal and refinishing.
Mold Prevention - To prevent mold:
Maintain leather pH between 3 and 5.
Apply Leather Mold Killer 3.6 as a preventive anti-fungal treatment, especially before storing leather goods.
For long-term protection, treat on an 8-month cycle, similar to administering antibiotics to prevent recurring infections.
Recommended Mold Decontamination Process
An effective decontamination sequence dovetails the following steps:
Contain and responsibly dispose of visible mold growth to protect health and the environment.
Erase residual mold stains using Eraser 4 for effective traction.
(Optional) Perform overall prep cleaning with Prep 4.4.
Clean mold-contaminated areas using Mold Cleaner 1.5, followed by pH-balancing with Acidifier 2.0.
Clean general soiling with Soft 3.8, and rinse with Rinse 3.0.
Hydrate leather structure with Hydrator 3.3 to relax and plump fibers.
Replenish fats and oils using Fatliquor 5.0 Plus to restore softness and tensile strength.
Apply fungicide treatment with Mold Killer 3.6 to disinfect and control residual mold activity.
Condition and protect the surface with Protector B Plus, imparting a buttery feel, rub resistance, and a pleasant leather scent.
Kit A3.mk concentrates contents require 1036g (1.14 quarts) distilled water to be mixed and filled before use with these selected leather-safe products:
Kit A3.mk Product Summary Includes:
Leather Mold Cleaner 1.5
Leather Acidifier 2.0
Leather Soft Cleaner 3.8
Leather Rinse 3.0
Leather Hydrator 3.3
Leather Fatliquor 5.0
Leather Mold Odor Killer 3.6
Leather Scent Protector B Plus
Leather Brush 1
Leather Eraser 4
Foam Brush 2
Towel 5
Leather Mold Cleaner 1.5 by Leather Doctor® is a leather-safe solution with a pH of 1.5, specially formulated for cleaning up mold growth on leather, suede, nubuck, and other protein-based materials.
It is designed for use as the first step before long-term fungicidal treatment with Leather Mold Killer 3.6.
Mold Cleaner 1.5 Key Benefits
Discourages mold regrowth — The low pH environment helps inhibit future mold activity.
Strengthens leather structure — Enhances ionic bonding between the leather’s protein fibers and its original tanning agents and fatliquors.
Safe for delicate leathers — Suitable for aniline, vachetta, nubuck, suede, and other absorbent leathers when used as directed.
Leather Acidifier 2.0 by Leather Doctor® is a pH 2.0 acidic rinse designed to control, neutralize, and restore leather’s natural pH balance.
Acidifier 2.0 prevents leather from denaturing, which can lead to bleeding, streaking, tackiness, and structural weakness due to alkaline overexposure.
Acidifier 2.0 Key Benefits:
Neutralizes alkaline contamination from cleaners, sweat, and body oils
Prevents dye bleeding and color streaking
Reduces leather tackiness and improves texture
Strengthens leather fibers and enhances structural integrity
Leather Soft Cleaner 3.8 by Leather Doctor® is a leather-safe, pH 3.8 mild cleaner formulated to effectively emulsify and lift general soiling without causing common side effects.
Soft 3.8 is among the mildest of cleaners with a lower cleaning power than Strong 4.3 and Super 4.9.
Why Choose Soft 3.8?
Soft 3.8 is the mildest among the Leather Doctor's range of cleaners which is safe for all leather, nubuck, and suede.
Always test clean with Soft 3.8 and evaluate the result to your satisfaction before progressively increasing the cleaning power to Strong 4.3 or Super 4.9.
Accumulated soiling may require the next level of Prep 4.4 or Prep 7.7 preparatory cleaners.
Penetrated body oil, grease, and sweat requires Degreaser 2.2 and is rinsed with Acidifier 2.0.
Provides the “just right” strength—a balance between under-cleaning and over-cleaning.
Part of a holistic leather-safe system: always follow rinse with Rinse 3.0
Soft 3.8 Key Benefits:
Gently Cleans Without Harsh Effects – Maintains leather’s natural integrity
Works Seamlessly with Prep 4.4 and Prep 7.7 – Allows for after cleaning of sticky residue
Prevents Rings & Browning – Ideal for pH-sensitive leathers
Residue-Free with Rinse 3.0 – Restores leather’s pH balance for long-term care
Leather Rinse 3.0 by Leather Doctor is a pH 3.0 leather-safe rinse formulated to remove suspended soil and restore the pH balance of leather, ensuring its structural integrity and long-term durability.
Rinse 3.0 Key Features & Benefits:
Removes Suspended Soil – Lifts and extracts emulsified soiling for a clean, residue-free finish.
Neutralizes Alkaline Residue – Restores pH balance to prevent damage from alkaline overexposure.
Prevents Tackiness & Dye Bleeding – Stabilizes the leather structure, reducing unwanted texture changes.
Enhances Leather’s Ionic Charge – Recharges the leather with a positive (+ve) charge, improving its ability to bond with negatively (-ve) charged tanning agents, dyestuff, and fatliquor.
Preserves Suppleness & Durability – Helps maintain the leather’s softness, preventing stiffness and cracking.
Leather Hydrator 3.3 by Leather Doctor® is a pH 3.3 conditioner that softens stiff leather by relaxing fibers and prepping it for effective fatliquoring.
Hydrator 3.3 Key Benefits:
Restores Leather Softness & Flexibility – Relaxes stiff fibers and prevents brittleness.
Smooths Out Creases & Wrinkles – Prepares leather for optimal softening.
Reactivates Dormant Dyestuff – Helps resurface color for a more even appearance.
Facilitating Colloidal Water Movement - Redistributing and balancing leather constituents.
Prepares for Fatliquoring – Enhances absorption of essential fats and oils.
Residue-Free & Non-Sticky – Ensures a clean, breathable finish.
Leather Fatliquor 5.0 by Leather Doctor is a pH 5.0 micro-emulsion of fat, oil, and water to restore the leather's original softness, strength, and flexibility.
Fatliquor 5.0 Key Benefits:
Replenishes Essential Fats & Oils - Prevents leather from drying, stiffening, or cracking.
Enhances Leather’s Suppleness & Elasticity - Maintains a soft, luxurious feel.
Strengthens Leather Fibers - Improves tensile strength and durability.
Creates a Breathable Structure - Ensures leather remains pliable without feeling greasy.
Prevents Brittleness & Fiber Breakage - Essential for long-term leather preservation.
Leather Mold Odor Killer 3.6 by Leather Doctor is a leather-safe fungicide designed to kill, remove, deodorize, and prevent long-term mold growth on all types of leather and suede.
With a pH value of 3.6, Mold 3.6 effectively disinfects and eliminates musty odors caused by mold activity after thorough cleaning and decontamination.
It provides a comprehensive solution to restore and protect leather from mold-related damage while maintaining its natural integrity.
What is Mold?
Mold is a type of fungus that appears as a fine, dusty growth on leather.
It is often accompanied by a musty odor and thrives in humid or poorly ventilated conditions.
Mold can cause discoloration, deterioration, and odor issues if not properly treated.
How Does Mold Damage?
Mold damages leather by breaking down its organic structure, leading to biodegradation.
It feeds on the leather’s natural fat and oils (fatliquor), and protein fibers, causing dryness, stiffness, discoloration, and odor.
If left untreated, mold can weaken the leather fibers, leading to cracking, deterioration, and permanent damage.
How Does Mold Growth?
Mold grows when moisture, warmth, and organic material are present.
Leather, being a natural material, provides an ideal surface for mold when exposed to high humidity, poor ventilation, and damp conditions.
Mold spores settle on the leather and thrive by feeding on the natural oils and fatliquor, leading to musty odors, discoloration, and deterioration if not properly controlled.
How Mold Control Works?
Mold control works by using antimicrobial treatments to eliminate active mold spores and prevent regrowth.
Similar to antibiotics, effective mold control requires a consistent treatment cycle, ideally every 6 to 8 months, to prevent re-occurrence.
Regular cleaning, maintaining proper humidity levels, and using Leather Mold Odor Killer 3.6 as a preventive measure help keep leather mold-free in the long term.
How to Prep Clean Mold on Leather?
Mold cleaning begins with removing, containing, and responsibly disposing of mold growth to protect health and the environment.
Residual mold is further removed using Eraser 4 for smooth leather and nubuck or Eraser 5 for suede.
The affected leather is then deep cleaned with Leather Mold Cleaner 1.5, followed by Leather Acidifier 2.0 to neutralize residues and restore the leather’s pH balance.
If mold has caused sinking pit damage, it must be physically removed during the rinsing process.
After cleaning, re-finishing may be required to restore the leather’s original look and feel.
Leather Scent Protector B Plus by Leather Doctor®, pH 3.2 enhances seating comfort, prevents sticky soiling, and reduces wear while adding a luxurious leather scent.
Protector B Plus Key Benefits:
Non-Stick Buttery Shield – Prevents ballpoint ink and dye transfer stains, especially on pastel leathers.
Squeak Reduction – Stops friction noise, ideal for motion leather.
Abrasion Resistance – Increases durability, reducing stretch, scuffing, and wear.
Breathability Maintained – Non-film-forming formula keeps leather naturally breathable.
Leather-Safe – pH 3.2 matches the leather pH neutral of 3-5.
Leather Scent – Enhances the sensory experience with a rich, luxurious leather aroma.
Regular use of Protector B Plus ensures long-term protection, a smooth feel, and a refreshed leather appearance, making maintenance easier while extending the leather’s lifespan.
Tools:
Leather Brush 1
Brush 1 by Leather Doctor is a detailing horsehair brush designed for gentle, scratch-free cleaning on all smooth leathers.
Features & Benefits:
✔ Soft Horsehair Bristles – Ensures safe cleaning without scratching or damaging leather surfaces
✔ Ergonomic Grooved Grip – Provides comfort and control for effortless detailing
✔ Sturdy & Durable Design – Built for long-term use in leather maintenance
✔ Ideal for Deep Pore Cleaning – Effectively loosens embedded dirt and grime without harming the finis
Perfect for use with Leather Doctor’s leather-safe cleaners to maintain leather’s pristine condition.
Leather Eraser 4
Eraser 4 by Leather Doctor® is used on all leather, nubuck, and fine suede for dry and wet cleaning with better greasy and gummy soil traction.
✔ It is also used in conjunction with Stripper 2.3 to strip off old and deteriorating finishes during refinishing.
✔ Dimensions: (L: 2.8 inches x H: 2 inches x W: 0.2 inches)
Foam Brush 2
Foam 2 is a 2-inch high-density polyfoam brush designed for durable, precise, and smooth application of leather care products.
Features & Benefits
✔ High-Density Polyfoam – Resists tearing and shredding for long-lasting use
✔ Even Product Distribution – Ensures smooth, streak-free application
✔ Controlled Absorption – Holds and releases product efficiently for optimal coverage
✔ Versatile Use – Ideal for applying dyes, finishes, and conditioners on leather and sued
Perfect for professional and DIY leather care applications, delivering a consistent and flawless finish.
Towel 5
Towel 5 by Leather Doctor is a high-performance, lint-free paper towel designed to perform like cloth for efficient cleaning and drying without leaving residues
Features & Benefits
✔ Lint-Free – Leaves no fibers or residues behind
✔ Highly Absorbent – Quickly absorbed suspended soiling
✔ Stretchable & Durable – Strong enough for repeated use without tearing
✔ Washable & Reusable – Can be rinsed and reused for multiple application
Perfect ensuring a smooth and effective leather care process.
Updated January 20, 2025 | July 2, 2025 by Roger Koh.
