Trick for old shower doors that WORKS!!
Short version of Awesome trick for shower doors in bad shape.  Even heavy soap and lime deposits can be removed this way. Spray clean shower and lightly rub with 000 steel wool (Lowe's carries bundles of this in hand-sized pads)  After rubbing, wipe with a damp cloth, then a dry cloth. You WILL see instant results, but depending on how long the stains have been there, you may have to repeat in some spots where it is heaviest.  I've never found anything this incredible at cleaning!
Rating: 5 stars