cleaning nuts, bolts, etc.

Harbor freight sells a small cement mixer for 150. Trim the paddles down to super short or remove them (looks like a couple bolts) and install a couple strips of 1/4" angle iron for moderated rotating - tumbling effect and chuck your stuff in there with a couple scoops of laundry detergent and fill with water. They will be clean as heck in a few hours and no harsh chemicals. Add sand to enhance cleaning in crevices.

http://www.harborfreight.com/1-1-4-quarter-cubic-ft-compact-cement-mixer-91907.html

Here is my thread on a tumbler I got from eastwood and my tribulations in trying to get bolts and nuts clean. Waste of money and time. I gave up on it because it took several days to make progress on a hand full of small parts so it was sadly anemic for getting goop, paint and rust off. Also, threads were generally not cleaned out well.

http://www.forabodiesonly.com/mopar/showthread.php?t=138012