Water and roof run off marks
Where water runs off roof and down side window there is always a mark that is hard to get rid of. I bought some glass stove top cleaner which is a mild abrasive and puts a protective "coating" on. Any...
Forum Discussion
I like Sam's club degreaser for this. Works very well. I think there is some type of petroleum based "runoff" that comes off the roof mixed with the minerals from the rain. I think the degreaser "destroys" the petroleum and thus makes the mineral removal easier. Simple green would work for this too.
