Bleach will just whiten the poop. It might cover the smell with a bleach smell for a while. Custodians where I used to work would often sprinkle bleach on the floor of a room so it smelled like it had been cleaned.
You want to clean your holding tank? Do what Billylll and I have done, install an access port, then clean it by any means that works. Brush, scraper, hose (not the one you fill your water tanks with), etc.
You want to clean your holding tank? Do what Billylll and I have done, install an access port, then clean it by any means that works. Brush, scraper, hose (not the one you fill your water tanks with), etc.