YES!! #0000 steel wool won't scratch glass! I know this for sure, because
i use 4'0 steel wool to remove markings on stained glass windows that i
make.
-matthew
first place in the county fair, best of show for a window :-)
email me and i'll send you the photo.

Matthew Pollard          "Racing with the wind and flirting with death
Dept. Of Chemistry        So have a cup of coffee and catch your breath"
University of Idaho
www.uidaho.edu/~poll7356