A few additional comments, besides the plate scrapping, when we sailed we never stacked any dirty dishes, thus less surface area to clean. However I could only do this when my wife wasn't in the galley.
After talking with Barry of Sue and Barry, we just bought a 12 gallon blue boy tote and a 5 foot tote hose. Once a day I train the gray tank via the auxiliary dump and pull it over to the dump station.
We just left Flamingo in the Everglades, which only has electrical hookups and after 4 days still had enough capacity in my black tank for a few more days, if you can trust the indicator lights.
I am being meticulous about keeping the tank clean and when traveling wrapping it in a construction grade black bag ind then wrappping in a blue tarp before it goes in the back of the car. Alternatively it is light enough that it could easily go on top of the P C.
I also have to agree with the comment about not dumping gray tanks anywhere but in designated dump stations. We've come so far in cleaning up our rivers and other bodies of water that we must guard against any action that could compromise them.
Bob