Describe the original location, when it first appeared and the products used afterwards. Include any rubbing, coating or redecoration you know about. Say whether the marks disappeared briefly, changed shade or returned in the same position. An overall photograph and a current detail help describe the condition without trying another treatment first.
Keep a product label or name where available, but do not apply more to demonstrate its effect. If the earlier work was carried out by someone else, share the details you have and make any gaps clear. The present enquiry should be based on what is known, not an assumed explanation of the previous result.