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Will Stain Remover affect clothing colour?Updated 4 days ago

TL;DR: Stain Remover is bleach-free, but some fabrics can still experience colour change depending on how stable the dye is. Always spot-test on an inside seam before treating a visible area.


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Koh Stain Remover
Koh Stain Remover with Foaming Spray Bottle

Why can colour change still happen?

Stain Remover is bleach-free and contains no chlorine bleach, oxygen bleach, or optical brighteners. The formula is classified as colour-safe on properly dyed fabrics. Some fabrics can still experience colour change after treatment, usually due to colour loss from the fabric itself rather than bleaching caused by the product. Fabric dyes vary widely. Colour change is more likely if the dye was not fully fixed during manufacturing, if the fabric is highly dyed, dark, or brightly coloured, or if the garment already had wear, fading, or heat exposure.

✓ Bleach-free formula

Stain Remover is bleach-free. It contains no chlorine bleach, oxygen bleach, or optical brighteners. The formula is classified as colour-safe on properly dyed fabrics.

Bleach-free No optical brighteners Colour-safe on stable dyes

⚠ Colour loss from the fabric

In some cases, lighter patches or fading can appear after treatment. This is usually due to colour loss from the fabric itself, rather than bleaching caused by the product. Fabric dyes vary widely, and some are less stable than others.

Not bleaching Dye stability varies

⚠ More likely if

! The dye was not fully fixed during garment manufacturing

! The fabric is highly dyed, dark, or brightly coloured

! The garment already had wear, fading, or heat exposure

Unfixed dyes Dark or bright Worn or faded

How do I reduce the risk?

Spot-test on an inside seam where the fabric is layered at the stitching, before treating a visible area. Follow the garment care label and never treat a "dry clean only" garment at home. Don't leave Stain Remover on longer than directed (5 to 15 minutes). Rinse and wash thoroughly after treatment, and don't let the product dry on the fabric.

✓ Reduce the risk

✓ Spot-test on an inside seam where the fabric is layered at the stitching

✓ Follow the garment care label. Never treat a "dry clean only" garment at home

✓ Don't leave the product on longer than directed (5 to 15 minutes)

✓ Rinse and wash thoroughly after treatment. Don't let the product dry on the fabric

Spot-test inside seam Follow care label Don't over-dwell

How do I spot-test for colourfastness?

Apply a small amount of Stain Remover to a hidden seam or inside hem. Wait 5 to 10 minutes, then blot with a white cloth. If you see dye transfer onto the cloth, the fabric isn't colourfast and you should not treat the visible area. Rinse the test area, let it dry, and check against the rest of the garment. If the colour and texture look unchanged, you're good to treat the stain.

✓ Spot-test in 3 steps

1

Apply a small amount of Stain Remover to a hidden seam or inside hem.

2

Wait 5 to 10 minutes, then blot with a white cloth. If you see dye transfer onto the cloth, the fabric isn't colourfast.

3

Rinse the test area, let it dry, and check against the rest of the garment. If the colour and texture look unchanged, you're good to treat the stain.


Koh Stain Remover

Stain Remover

Spray-on pre-treat for stubborn stains. Spray, wait, then wash.

Koh Stain Remover Starter Kit

New at Koh?

Stain Remover Starter Kit pairs Stain Remover with the Foaming Spray Bottle for targeted application.

See the laundry dosing guide

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Last reviewed: July 2026 · Koh UK

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