My experience...

Agree with eating right and light leading into SO play. Also, stay well hydrated. Coffee is a natural stimulant to promote bowel movment. That is best - if you can have one just prior to SO play.

Then, 2-4 hours before SO play, I like to get in the shower with a longer and slender dildo. Lube it up well, and insert. You want to pass the upper sphincter. The dildo alone will also promote a bowel movement to putting pressure on the muscles which trigger the brain to go / push. But, even after that happens - I like to continue to work the dildo to ensure cleanliness. Pull it out and observe and clean, repeat, repeat, repeat. Again, lube up well, and I like to introduce a very mild and small amount of soap. (Don't over do the soap, as that will irritate the rectum). But, the soap helps clean the rectum. Continue with the dildo until it comes out clean. Then, insert fingers, and basically inspect the rectal area.

Try not to overstimulate during this process. Save that for the SO play! Really focus on the cleanliness, as that is the purpose here. Lots of lube, light on the soap, do not overstimulate, observe, repeat.

No bags, no Fleets, no oral laxatives, no oral salts, no oral mineral oil, no rectal suppositories.

Only items needed - Mild soap, lube, dildo, time and patience.

And do focus on the days beforehand. Diet, hydration, and drink lots of coffee. Exercise is good too.

Good luck. Hope you find this beneficial.

Also, listen to others on this thread. This is what has worked for me. Others will have knowledge and experience as well. And my domme has helped me develop this routine, and has validated that it has worked best over time (again for me).

Celeste