Seif 11: My hands got dirty. What can I wipe them on? (hint: cow tails. Maybe also hand towels.)
Seif 12: Drying dishes - when is thatassur because it could lead to wringing out the towel?
רמב"ם הל' שבת כב:יט ומגיד משנה שם (ראה גם תוספתא שבת יז:ה וב"י שב:יא)
(Free easy way to remember סעיף יא - it's 11, and it deals with two tails. So imagine the two 1's as tails. For יב, all I have so far is "YouBetter come up with a better mnemonic for this one about drying dishes")