Use your hose and blast it out. You need to make sure in the future that you are running water into the bowl before you are flushing. Using lots of water with each flush solves this problem. since the RV toilet does not have a tank; filling the bowl serves the same purpose.
they make wands which can be put into the toilet throught the flusj hole and they have a strong stream of water that will help clean and flush the insides. In my case it also cleans the sensors so I can judge water level accurately.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)