Should I mention a spray that did not help?
Include its name, timing and application area if known. The attempt remains part of the current surface history even without improvement.
Can a successful wipe prove the cause was condensation?
No. Report moisture observations and recurrence so appropriate assessment can consider the cause rather than infer it from a product’s effect.
What if I cannot remember the product name?
Say what you know and identify uncertainty. Timing, the area treated and changes afterwards are still useful enquiry details.
Should I apply a different product before the visit?
Do not experiment or mix products. Keep the condition clear and ask about suitable preparation for the agreed assessment and work.
Will treatment reverse a change to the paint?
That should not be assumed. Describe damage or staining so suitable surface work and any separate renewal tasks can be considered.
Does the old quotation still define the new work?
Check the current scope and amount. Returning growth, material changes and moisture findings may require a different enquiry or separate tasks.