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So not only was he an idiot about the soap, he also didn't scrape or rinse his dishes before putting them in the dishwasher. Awesome.
I mean, if you wash the dishes before they go in the dishwasher I guess they come out clean, but to me the point of a dishwasher is to do a more efficient job of it than I can. I scrape but do not rinse, because rinsing then washing is using more water, not less.
Only remove solid chunks, you don't need to rinse them before hand. That's exactly what the dishwasher does in its first washing cycle (the one without the soap) and doing it by hand only wastes a lot more water.
Not if you're stuck with a shitty and/or old dishwasher like most apartments and older homes have. Growing up in the 80s/90s with a brand new house we still had to scrape/rinse the crap off if we didn't want to find crud in the bowls and such. All y'all downvoters are some privileged mofos.
Some modern dishwashers don't need a pre-rinse (and are actually more effective if the dishes aren't rinsed first due to how fats work). See this video from Consumer Reports or search dishwasher rinse first.