Re: clogged sink
Sounds like the clog is past where you are able to reach with the things you've tried. Drain cleaning liquids don't work, don't bother trying, the only way to successfully remove a clog is with a snake. If you feel confident that you can operate a 100' rental snake, then go rent one, otherwise call a plumber to come snake your lines for you. While he's there, have him snake ALL lines out to the main, this will help to make sure you have no problems into the foreseeable future.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!