Things You Can Put in the Dishwasher
Rain boots should have the liners removed and lie horizontally. Hook flip-flops on tines in the top rack. (FYI, Crocs are not dishwasher-safe.)
Tools with metal or plastic handles will be fine. Towel-dry afterward to prevent rusting.
Ceramic cabinet knobs do well in the silverware basket, so if you feel like embarking on the process (remove, wash, replace), go for it.