Hello to each other, this is now my first post here in the forum and – as indicated in the title, it is about cleaning a disc (the rear window of my W resp. V220). Due to a leak in the garage roof the “brothers” siffles for days on the rear window. Today, after I have noticed this, I reached for the usual tools (glass cleaner) and had to find that these “water” stains cannot be obtained from the glass. Also on the disc frame stains have formed t and – also these defy my cleaning actions. No idea about which acid mix the rainwater became. Does anyone of you possibly have a bomben house remedy for the disc (glass) or is there special cleaner for car windows? The colleagues A*ax, Si*olin etc. I already through… Ok – and now I have written a lassiter for such a crap. Sorry. Greetings and thanks