I just remodeled with marble counters and floor in bathroom and didn't want to have ANYTHING that my cleaning lady could damage surfaces with so I got this which is all purpose cleaner for mirrors as well as marble surfaces.

MB Stone & More Multi Surface Cleaner

Probably impossible if you are talking about store bought. Unless you get it all over the place, you are probably fine using the regular stuff or you can spray it on the cleaning cloth vs. on the window to eliminate over-spray.

If you are more worried about it than that, you will have to use soap and water.

Nothing cleans windows better than good 'ol Windex IMO. Plus, if you're spraying directly on the glass, you might get minimal amount on the marble but probably nothing to worry about. You could put down a towel where you're working to catch any over-spray to be on the safe side.

Helen suggested a good product. Here is one care kit we provide our marble clients (it is the same manufacturer as the one Helen noted). The MB-5 is actually great on glass. Don't forget the toilet cleaner as the harsh chemicals in most toilet bowl cleaners wreak havoc on marble. Note that when it comes to shower glass and marble shower walls, the most important products are the squeegee and the microfiber towel used after each shower.