Anyway, while I want to boil it before the first insertion and possibly after a cycle, I'd rather just use soap and water most of the time, and for some reason the only non-bar stuff that we have in the house is Bath and Body Works soap, which I really didn't want to use what with all the perfumes and dyes and little beads. I didn't want to shell out for the Divawash, and being that this was a very granola sort of store, I went scouting in the soap aisle and found Dr. Brommer's, which I know someone here mentioned using for their cup. My question is mostly just to check that yes, I can use it for the cup with no adverse effects. The type I got (the little 2 oz one, so if I'm wrong I didn't spend much!) is the Unscented Baby-Mild Castile liquid soap. I'd appreciate if anyone who has used this could let me know whether it worked for them.