Describe the extent of the concern
Give the location of the visible mark and explain whether the incident happened once or repeatedly. Say which cushions, arms or fixed panels were affected and whether there is a persistent smell. Include concerns about the filling rather than assuming the visible fabric describes the entire problem. A wider photograph and a closer view can show the area, while the written history supplies information the images cannot.
Name products already applied and explain their effect. Avoid layering further unfamiliar products or repeatedly scrubbing while treatment is being considered. Some staining or odour can remain, particularly with damage or contamination beyond the accessible surface. Discuss the improvement you want without relying on a promise that cleaning will resolve every part of the problem.