I have the same issue except I 'burped' my enema bottle in my bedroom. (I would never have been able to walk from the bathroom to my bed...I don't do well with those enemas) It took a number of days for me to figure out what that streak was going down my wall. The same issue happens with the underside of the toilet seat.
The suppositories have the same effect with the toilet seat, I haven't had any wall issues with the supps
I try my best to imagine it does wonderful anti inflammatory things to my bowel.