I've seen DIY "stained glass" paint kits that let you change glass to a slightly milky appearance. Perhaps a clear-ish version of that would work for small patches? I'm not optimistic, if you used a glass cleaner spray, though...

I know that hydrofluoric acid (HF) is used for smoothing cut glass. I assume that some mixture of HF and other acids is use to produce frosted glass. HF is nasty stuff and potentially very dangerous, so you wouldn't want to use it home... (AG is joking. HF causes nasty deep burns - you don't want to mess with it unless you know what you're doing and have the proper equipment - http://en.wikipedia....uoric_acid#Safety.)

I thought most frosted glass doors were made by sandblasting. Is removing the door, masking areas you need to protect with masking tape, and taking it to a shop that does sandblasting (or grit blasting) an option? I would think that that shouldn't be very expensive, but safely getting it there and back might be a problem. Check the Yellow Pages?

HTH a bit. Good luck.

Cheers,
Scott.