Thanks for the further info, Maggie. I'll be interested in hearing what effects it might have. Some seem to notice a pretty dramatic change just hours after spraying it. The guy who was going to sell me the 30% said to cut in half to 15%. We were going to buy some at the store but it was only 10%. Maybe I'll go get some tomorrow, regardless.

I use it cut in half with water to wash mirrors. I keep it in a spray bottle and haven't had any problems with it eating away at the plastic or anything. NO rubber, though, so maybe that's why.