Here's one guy's method...
"...on cleaning yourself out in preparation to having your asshole “tended to”--rimmed, fucked, and fisted--avoiding the possibility of any unwanted “outcome” fouling things up.
In German, with hard-coded English subtitles, the video is a guide to “quickly get your butt cleaned”--NOT for “the lovers of deep enemas…deep fisting…” where things have to be “…clean up to the elbow.”
He’s a pleasant guy and he gives a real detailed and very personal look at douching in preparing for anal fun…when you want that raunchy fun to be clean!
Included are the “what nots”--as in “what not to do”--along with suggestions regarding nozzle tip, and even toilet “tissue” recommendations!" - "Lickin' & Stickin', Munchin' & Punchin' - Instructional Video" - https://www.gaytorrent.ru/details.php?returnto=%2Fmytorrents.php&id=af02b0575d3f43e8ffef56667042f8ed552a61cbfcf592e7