This reminds me I need to finish my dusty article about anal play.

People often seem to make it sound more complicated than it is. Like lots of prep with multiple steps.

It's really just rinsing a few times. Maybe making one or two different diet changes if you really feel like you want to make the rinsing process as easy as possible.

If you buy a pre-filled douche, remove the solution and replace with tepid water. *Gently* rinse until clear. Don't rocket-shoot it up there. It's not necessary and more likely to go up farther than you need...and then come out during play.

I find that if I'm doing play in the rectum and not going into the sigmoid colon then there is no need for a deep cleanse. Once you've douched a handful of times you should get a sense of how deeply the water is going and when you've gone as far as you need.

Changing your diet isn't necessary but it can facilitate an easier cleanse. Fiber = more solid BMs = less messy rinsing.