Put 5 gallons of water in all tanks.
Add a good tank treatment to break down solids and deoderize tanks.
Keep both black and gray valves closed while camping even if dump is available.
BEFORE dumping, top off tanks with water, it creates a better exit flow, and cleans the tanks.
Dump the tanks before you leave, and refill with water; then dump again as soon as you arrive at the next park.
The sloshing action during driving will help clean the tanks and breakdown any remaining solids.
NEVER use a dry tank; always add a tank treatment and water before use.
When possible, return home with tanks half full of fresh water to "stir" the tanks.
Top off the tanks with fresh water and dump before storing.