[galangalalgol]

Some people use ice to clean RV tanks too. Flush a bunch of it then drive a while and let it bang around as it melts then drain it. Probably would work on a boat too.

[js2]

Works well for garbage disposals. Also a good way to get rid of freezer ice that's bern through too many defrost cycles.

[hellotomyrars]

Yeah. Used to do this in my years of traveling in a fifth-wheel. Works great.