It's one of the many subjects that gets, (for some) a lot of different opinions. I use the pouches, but also when I dump the black I flush real well then add water, a pouch and Dawn soap(about a cup). Seems to keep my sensors clean as well. Several years of this method has worked for me. Good luck !
Jerry and Debbie
2015. Hurricane 32N /Kia Soul toad
Crawfordville Fl. Vietnam Vet.