This may sound too good to be true, but my aunt just bought one and said it's the real thing.  This micro fiber cloth cleans and polishes everything- from windows to stainless steel to soap scum using only water.  It's hypo-allergenic and environmentally friendly- it can be washed up to 600 times in the washer.  It does not give it's secrets away online, so you may want to look for the fine print (I couldn't find it).  But even if it saves on paper towels- it may be worth it!  Take a look!

(My aunt ordered off of QVC.)