Should an unsuccessful product be mentioned?
Yes, where known. It may have changed the surface even if the visible concern remained, so describe its use and effects.
Does a lighter patch mean the mould was resolved?
Appearance alone does not settle the moisture or material question. Explain what changed and any returning growth for assessment.
Can I try a stronger product before calling?
Avoid adding another improvised application. Share earlier care and discuss suitable work for the actual surface and condition.
What if I do not remember the product name?
Say what you know and identify missing details honestly. Do not invent a treatment history to complete the enquiry.
Can cleaning restore every changed finish?
No new-finish result should be assumed. Damage, staining and growth need separate descriptions and suitable scope decisions.
Why keep old photographs after treatment?
They can make the same position and changes identifiable. Keep dates and distinguish cosmetic marks from new wetting or growth.