I have done it as side work....not full time. Sprayer hose, plastic scraper and an all in one machine.

Dishwasher make higher hourly wage than wait staff, so NO sharing tips generally. Most of the dishwashers here are developmentally disabled so if they come help bus a really big, messy table, the wait staff will often share the tip for THAT party.

Around here, there is NO pooling of tips. You make it, you keep it. It's called incentive to be a better server.

The worst part is cleaning up deliberate messes, usually left by spoiled, snotty young people.