Hey Katie79
Have you considered not douching?
Douching can often lead to more mess, particularly if you're being really anal (pun intended) about it. Using too much water, for example, brings waste from deeper in tour colon (which would otherwise be out of the way of anal sex) into your rectum, which is where a toy or penis is going to go.
Also, douching too often is bad for you anyway.
I always recommend just making sure you've been to the toilet within a few hours of anal play, warming up, and using plenty of lube. This should be more than enough to ensure a clean playtime.
And remember, poop is just poop. If you're going to stick things in your butt, you both need to be prepared that it could happen. It's an occupational hazard of anal platy, I'm afraid.