I would never try one of those in the Thetford, especially given the problems I have in evacuating all the solids when dumping. And with all the other problems I've had with the Thetford, I've never had a problem with bowl residue. One thing that may help is to flush for a few seconds before using the toilet. And if that doesn't work, I'd spray a touch of Teflon lubricant in the bowl before each use.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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