What chemicals: Water (but see note)
IS bleach a good product: NO one of the worst in fact.
Notes
There is an entire industry (Chemical) designed to empty your wallet.. They talk about the Stink and how our chemicals eliminate it, Digest the waste and so on.. There is a slight truth to the 2nd claim in some cases (Rid-Ex for example) None to the first. ONE time I've had stink issues.. Turns out that in some parks the underground plumbing is very stinky (The park I'm in for example) and I left the gray valve open, the stink was backing up from the septic system. Closed valve, stink gone, Like magic.. Had same thing happen in the office I used to work with,, People complaining of stink in restroom,, I poured water into the floor drains (Renewing the water trap) Stink gone, Like magic.
Waste Digesters however.. Those actually work... S*L*O*W*L*Y.
A good biological waste digester (RId-EX for RV claims to be one, Have not tried,m have used a few others) IF your rig seems to fill swiftly you may have the dreded POOP PYRAMID,,, (A pyramid of dried poop) You can break it up using a valterra Master Blaster or home made equal.. Or you can try adding lots of water (fill tank like 2/3 and some Digester and letting it sit for a month, Dump and repeat. Dump and repeat. May or may not work. Again, This is theory I have never tried it. I've watchewd them use a master blaSTER, THAT WORKED.