Show the affected wall, joint or cupboard edge with its surroundings, then add a safely accessible detail. State the material where known and explain when marks appeared or returned. Mention plumbing incidents, extraction concerns and earlier products without diagnosing the cause yourself. An appliance or cabinet may limit access; say so rather than moving heavy equipment or opening panels to investigate. A clear location and history help plan the actual assessment.
Ordinary grease and residue tasks can be discussed through a separate kitchen cleaning request. They do not replace mould assessment, suitable treatment or attention to moisture.