I have good luck cleaning bottles with any brand straight amonia. It works great for that black - brown sticky remains left in bottle, just let it sit over night. Also works excellent on sticky price tags as it removes them instantly with no hassle. CAUTION do not use in a bottle that has pot stones as Ive had a few that react and will start cracking at stone and wont stop until your bottle is worthless. My main tools are a half of a coat hanger that can be bent with a pair of pliers to get in those tough sholuder spots, and a green 3m pot scrubber that can be cut to fit . For the finishing touch a bit of amourall on the surface does a great job at restoring some original shine,and some inside will help to as long as you wipe it out with a paper towel. Ive have conquered the black, brown ,and rust stains, but the white ones are still a battle.