I have mould stains.

In humid conditions, mould can grow on any surface. In this environment, mould usually starts growing on the thin moisture layer that forms on top of a surface and in crevices (such as the grain of timber). Sometimes mould may be mistaken for other dark coloured stains like tannin.

1. Wash with diluted bleach solution.
2. Then wash with an oxalic acid cleaner.
3. Apply Intergrain UltraPrep Mould Killer.
4. Apply top coating.