Funny story about ice... I had recently purchased a used TT, had taken it out once locally on a weekend jaunt, and was about to go for a week long camp out in central Virginia, about 300 miles away when I learned about the geo method, and had read about using ice to agitate and knock "stuff" off the sides of the tank.
I did the geo stuff, and before leaving for this first ever long trip, dumped a bag of ice down my toilet, and had my friend do the same.
Due to weather issues, we didn't get out of town until much later than expected, and we ended up not getting to our destination until about 2:00 am. Neither of us wanted to be "that guy" that wakes the entire campground up in the middle of the night, so we decided to camp out in the local Wal-Mart parking lot until morning.
I can attest that dumping ice in the tank is HIGHLY effective in loosening poo that has hardened to the tank walls. HIGHLY!!
It was the stinkiest night of my life, and I thought my DW might kill me right then and there.
2008 Rockwood 8315SS