Leather Stain Removal
White Marks on Leather: Find the Cause, Then Fix It
Most white marks on leather are salt, spew, mold or product residue. Use the diagnosis table and conservators' tests, then the right fix for each.
A white mark on leather is usually one of four things: salt left by water or sweat, "spew" (fats from inside the leather rising to the surface), mold, or product residue sitting on a coated finish. Each needs a different fix, so identify it first. A white deposit can be wax or oil rather than mold, and conservators use a simple swab test to tell them apart.
Use the table to narrow it down, then follow the section for your cause. Other stains are covered in our leather stain removal guide.
Quick diagnosis table
| What you see | Likely cause | First fix | Source |
|---|---|---|---|
| White tide line or crust after rain, slush or sweat | Salt | Wipe with a clean, damp cloth and let dry naturally | – |
| Very white, powdery or waxy film; feels slightly waxy between your fingers | Spew (fatty bloom) | Wipe gently with a soft cloth; expect it may come back | – |
| Web-like or powdery deposits, often with a musty smell; green, grey or black spots | Mold | Isolate the item and follow the mold guide | – |
| Cloudy or tacky patches after conditioning coated leather | Product sitting on the surface | Buff with a dry cloth; use only a tiny amount next time | – |
| Pale line where the surface is scraped | Scuff or scratch in the coating | See the scratch guides | – |
| Ring with a darker or lighter edge after a spill | Water mark | See the water-stain guide | – |
Test 1: spew or mold?
Conservators and leather vendors use three simple checks:
- Look at the color. A leather-care vendor says spew is very white, while mold on leather tends to be green or grey. Mold can show white on dark leather, though, so color alone isn't proof.
- Feel it. Spew feels slightly waxy when rubbed between your fingers.
- Warm it or swab it. Spew melts under low heat, and a hair dryer makes it vanish for a while before it comes back. The Canadian Conservation Institute instead rolls a cotton swab dipped in mineral spirits over a small hidden area; if the deposit is gone after about 15 minutes it's likely wax, and if you're unsure, treat the item as moldy.
Mineral spirits are flammable, with a flash point of 102-110 °F (39-43 °C), and can irritate eyes, nose and throat. Avoid skin and eye contact and work with good ventilation.
Salt marks
Salt from sweat or water dries as a white residue. Leather Collection's care instructions say to wipe winter salt stains with a clean, damp cloth and let the leather dry naturally. A leather-goods maker brushes lightly along the grain with a soft brush, then wipes with a dry microfiber cloth.
Stubborn tide lines on shoes and boots have their own step-by-step: how to remove salt stains from leather.
Spew (fatty bloom)
Spew is a white, crystalline, waxy substance formed from fats or oils that come out of the leather. Conservators call it a non-damaging reaction in leathers that were dressed with fatty or waxy compounds; a change in climate makes those compounds migrate to the surface and solidify. A vendor adds fatliquors from tanning and temperature and humidity swings as causes.
How to deal with it:
- Wipe it off gently. Folger conservators wipe spew off carefully with a soft cloth.
- Expect it to return. An Alaska State Museum conservator says it comes off without much trouble but always comes back, and there's no gentle way to remove it fully.
- Cleaning alone won't stop it, according to a vendor that sells a spew stabiliser.
Heat and leather cream: who says what
| Method | Who suggests it | The other side |
|---|---|---|
| Hair dryer on high, a few inches away | A jacket retailer | A vendor says spew comes back after heating; shoe makers warn blow dryers can warp and crack leather |
| Leather cream over the whole surface, then wipe off | A leather-goods maker | A vendor says fat- or oil-based surface dressings can cause spew; conservators link spew to dressed leather |
Mold
Mold on leather can look like web-like white deposits or white, green, grey or black powder, and a musty smell is another sign. Left alone, it attacks and weakens the leather. Don't use this page's wipe methods on mold. Follow how to remove mold from leather, which covers protective gear and drying.
Product residue and scuffs
On coated leather, conditioner can sit on top and leave cloudy or tacky patches. One retailer's routine is a tiny amount of conditioner, then a light buff with a dry section of the cloth.
A pale line that won't wipe off may be a light scratch, where only the coating is damaged. See how to remove scratches from leather.
Quick answers
How do you get white marks off leather?
Find the cause first. Salt comes off with a clean, damp cloth. Spew wipes off with a soft cloth but may return. Mold needs its own method.
What causes white haze on leather?
Most often spew: fats and oils migrating to the surface and crystallizing. Conditioner left on a coated finish can also look cloudy.
How do you clean white spots on black leather?
On dark leather, mold shows white or light, and spew is very white too. Run the tests above before wiping anything.
Can I use a Magic Eraser on leather?
Procter & Gamble says the Magic Eraser isn't recommended on glossy or easily damaged finishes and should be tested on a hidden spot with light pressure. It doesn't name leather. See can you use a Magic Eraser on leather?.
What does hydrogen peroxide do to leather?
None of the white-mark sources we read use it. See can you use hydrogen peroxide on leather?.
For its own garments, Leather Collection's care instructions say to wipe winter salt with a clean, damp cloth and test any product on a hidden area first. The store doesn't sell cleaning products.
hosob Editorial Team
hosob articles are researched from published sources, cited in the text, and reviewed before publication.