Include a wider view and an accessible detail of the affected finish. Describe peeling, cracking, softening or staining you have already noticed without scraping, pressing or opening material to test it. Say when changes appeared and whether water or earlier treatment preceded them. A photograph can start the enquiry, but does not establish the condition of concealed layers. Keep known product and repair details available for the inspection discussion.
A general domestic clean addresses separate tasks. It should not be taken as assessment, repair or suitable mould treatment of a damaged surface.