Horrible smell from RV toilet - any recommendations?

If you have a poop pyramid then it will take more than chemicals to get rid of the stink. I vary rarely use chems. I almost always use the black tank rinse when dumping and try and make sure there's sufficient water in the tank before using it. Heading into the 6th season with our 5er and I can count on one hand the number of times it's stunk. When it does act up I do dump some chems in. Until then I just keep lots of water in it and rinse it when dumping.