Quote Originally Posted by GS535i
Try a spray bottle of your favourite blue glass cleaner ( eg, Windex) and a hose: wet a trial spot down well with the glass cleaner .... wait a min. or so .... and hose off.
The mild alkaline action of the aqueous ammonia often does the trick ....
Put some windex on it. Got a rash? Put some windex on it. Blisters? Windex.