We wash off all biofilms and then do a 400-800ppm bleach bath covering all surfaces for at least 10-20 minutes before drying for a few days. Water change hoses and nets are usually thrown away for new shipments. Probably overkill for the usual aquarist, but we bring in many shipments from around the world that could carry all sorts of stuff, so we go the extra mile.
There are some studies out of a Japanese aquaculture lab that show that in their conducted assays, cysts of Cryptocaryon, dinospores of Amyloodinium, and the eggs of many monogenean flukes become inviable after 24 hours of desiccation under lab conditions. So drying for a few days to ensure all nooks and crannies are dry should probably be sufficient.