Here's what we do to get around developing the dreaded ^ at the bottom of the chute in our TC. Having experienced it several times, once had to take a stick to it and once was able to shake the camper and it went on down.
Take a dish tub about 12x15x6 and fill it with water then pour it down the throat of the commode. Empty the tub as fast as you can. The volume of water hitting the solids moves it along. We do this every 2 days. Simply flushing extra toilet water down doesn't work nor does pouring it out of a gallon jug.
