cleaning out black tank and toilet bowl

Never use anything in the black tank. My procedure is this, every time tank is empty I fill toilet bowel almost rim, then dump it into tank. I do this 4 times. That way I feel tank sloshing as you travel will help to clean and brake up and left over items in tank. If solids are going in to toilet, I fill bowel so about 1/2 of the area is covered with water. Every few days I take dish water in a dish pan and dump it down toilet, then use a "bottle brush" to clean up bowel as necessary. Never have had any odor or clog problem.