Try caffeine. Many pornstars and sex workers do the coffee enema, I think it's doctors prescribed as well. Or go to the doctor every month or week as your routine
What is your preferred cleaning method? I love to be fisted anal. But the time that I need for cleaning is really always very long. For really deep fisting (elbow) I need 4 hours of cleaning time to be sure that it doesn't suck. Is there any way that can be done better and faster?