Mould / mildew × Grout
How to remove mould / mildew stains from grout
This guide is for Grout. It does not create separate pages for fresh, dried or set-in states.
Blot or lift the mould / mildew first, then use the smallest amount of a cleaner labelled for grout. Keep the surface rule in view: Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
Keep it simple.
- grout-labelled cleaner
- soft brush
- clean water
- gloves
- eye protection when the product label calls for it
- mild detergent or a labelled mildew product
Act before it dries.
- For a small, non-porous spot, follow the surface maker's cleaning instructions and the product label. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
- Ventilate the area and keep children and pets away from cleaning chemicals. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
- Rinse or wipe residue away as directed and dry the surface. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
Use less, check more.
- Do not treat a large, recurring or porous mold problem as a simple stain. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
- Use only one labelled product at a time and follow its contact and rinse directions. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
- Escalate to professional remediation when the area, material or health risk is beyond a small surface spot. Work with a soft brush and a product labelled for grout. Rinse thoroughly and keep the area ventilated.
Work in this order.
- 01
Read the material or care label and test the method in an inconspicuous spot.
- 02
Remove excess mould / mildew by blotting or lifting; do not spread it.
- 03
Apply only the grout-compatible product or detergent called for by the source and label.
- 04
Rinse or blot away residue when the label or surface method calls for it, then dry fully and inspect.
- mixing bleach with any other cleaner
- dry brushing or disturbing a large mold area
- using bleach on a surface the maker excludes
- mixing cleaners
- hard metal brushes that remove grout
- bleach on a surface or sealer that the maker excludes
- Use one cleaning product at a time. Never mix bleach or any disinfectant with another cleaner.
- Ventilate and use gloves or eye protection when the product label calls for them.
- If the finish, color, backing or odor changes, stop and use the maker or a professional cleaner.
If the mold is extensive, keeps returning, affects porous material, or may be linked to water damage, stop treating it as a spot stain and use CDC or professional remediation guidance.
Why this guide says that.
Mould / mildew guidance was checked against the cited source and narrowed to the Grout scope. Chemical combinations not required by the source were intentionally omitted.