I use bleach, around a 1:15 mix. As long as it isn't something really porous like wood, it should be fine. I rinse with water with double the dechlor, then rinse again with fresh water. Never had a problem.
The reason I use bleach is that it's always down here in the laundry room. If salt worked better, or bleach gave me problems, I'd buy salt. Bleach is already paid for.
Tolak