Geo Method question

Water softener salt is out of the ordinary and not likely to do the job. The accompaniment for the soap is usually Calgon or Twenty Mule Team Borax (washing soda). This stuff makes the walls and base of the tank very slippery and therefore less likely that "something" will stick. You will truly understand slippery when you do the mixing. Use the cheapest liquid detergent you can find. Additionally a full black tank will flush better than a partially full tank and encourage the use of lots of water.