i use a garden hose with a 45* angle on the nozzle and take the trap off. just dont flood everything. but you can sweep all the gunk out that way. i started doing this on a unit that had a curb that was unlevel. no problem since
I think water is about a mile away lol. The pan is not in good reach either. I think flushing would be the best, the ceiling below is ruined already so I guess what's the difference lol.