Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Rinsing because of Ich sounds like a good idea, sort of added insurance. Ich does not live when it is dried (this would also have killed the beneficial bacteria) and does not live without a host. It can live for only a few days while searching for a host.
If you want to, empty a tank of fish and leave it empty of livestock for a week, and feed the bacteria with ammonia, just like doing the fishless cycle. That will keep the bacteria alive, but the Ich will not survive.