I use dish soap and it seems to have worked fine for me. In theory, dish soap is formulated to clean bacterium like salmonella off of items that may come into direct contact with our mouths making them safe enough to do so. I made this choice since I wondered about "no rinse" products leaving chemical residues behind and since my guys are in a relatively enclosed space I didn't like the idea of their lungs being exposed to too much if it's not necessary. In 5 years, and currently 17 snakes, so far so good...