I've noticed that there's a general trend towards specific methods of cup cleaning (boiling, immersion in various chemicals). Let's here it for the other cleaning methods! I'm sure there are as many as there are cups on the market!
Depending on the amount of time I have available I either boil my cup or if I don't have the attention span or time to watch it on the stove (I have to watch it or I'll burn the house down, being so easily distracted) I'll use a sex toy cleaner for silicon products (it takes 2-4 minutes per instructions on the bottle).
What do you use if not any of the more common methods?