Disposal caution: do not run the disposal with hot water, especially if you've been letting it soak. It can overheat, and then no more disposal, which is never good. Soak with hot water, drain, then run the cold water and turn it on. (Quick hot water bursts are okay, but not sustained periods.)
Oh, crap, did I say hot water? Don’t run disposals with hot water! Cold. Cold water.
ETA: Phew, I didn’t say hot water. But, yeah. Cold only. Overheating is bad.