I use mine a lot, If I make a mess I hose it down. It keeps flies from hanging around the boat.
Holding tank OK. But imo one that pumps lake water in no thanks. Flies love stinky green lake water. I hàve never understood the whole in boat washdown. If I need it right away I use the spray nozzle at the cleaning station.

Polekat what do you have for a wash down hose ?