I have in my car seats old stains and water marks, which so far I could remove by anything (household cleaners, shaving cream, etc.). Now I have today bought (foam) the extreme Sonax Upholstery Cleaner and equal tried. And I have the complete seat so generously sprayed that he was everywhere covered with foam. The missing, not foamed places I have carefully painted with the existing foam and reamed after about 2 minutes with a cloth. The foam has largely dissolved, and the seats felt to damp. Most spots had already disappeared after the first treatment. Hard water spots I sprayed a second time and repeated the whole. Finally I reamed with a dry ink something. The result is impressive: The seats look fresher than before, and the spots are largely gone, most are a few remaining edges to guess. The trigger point there because of the fertility of the can: After a treatment of the front and rear seats, the bottle is empty. Nevertheless, I'll buy myself the same agent again for the second car.
