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Even with my factory sprayer I use a valve at the exit to close off and allow the clear elbow with hose fitting to backfill the tank for several minutes (just like a Flush King). I do this about 3 or 4 times until it runs mostly clear. I then close the black tank valve and do the galley tank the same way. Then finally, I end it all with the bathroom tank. Takes a long time, but I feel good the tanks are the cleanest they'll be.
Since the drains are the way they are, it's the best I can do with the crappy designs (drain not at the bottom center? Whose stupid idea was that?) Even the fresh water tank has a drain in the middle. Maybe it's because there's too much chance of a clog in the case of the black tank since it could be a few days between draining and clogs would be more prevalent.
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