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put a couple coats of good wax on it

Well you can go to a car parts store and buy a bottle/can of car wax ! Wax or a glazing product will bring the shine back. $20 and a Saturday afternoon. Go for it. the exercise will do you good.

its better to let it sit for a week or so ,to harden and dry

use a rag.....

Are the two toilets the exact same model? If so then you possibly need to snake it. Here's how http://www.ehow.com/how_6083501_snake-toilet.html

If its tint on the window, it needs a new one... if not. Goop off from homedepot does wonders!!!! Use that it cleans very good. until u go and buy that, use Peroxide. that cleans glass surprisingly well.

You do the same as if you had clear coat on it, but you have to be a bit more careful with it, depends on the amount of paint thickness left. if its fine and smooth with out fine scratches,buy a small can of rubbing compound try a small area down at the bottom of door,then polish by hand with cheese...

not a problem. do it again by hand not machine. yes its alot of work but you get what you pay for, in ??or labor