I’m very anal about my prep :p pun intended.. When I first got into anal, I used to do a full cleaning, an enema of some sorts.. Now I just do a quick cleaning before play, nothing too deep. Maybe it’s the fact I have anal regularly, but sometimes just going to the toilet half an hour before having anal, I am clean enough and don’t need to push any water in to clean. I think this depends also on how regular you are. I’m pretty regular and I rarely worry about this..