I don't think there's a better substance than custard for an easy to clean, cheap, quick, and satisfying session!
Starting off in Rio Speedos, half a carton of custard is let loose down the front, and then back of them. Sitting down, there's a satisfying eruption of custard. Eventually I opt to pour a little on my face, then in my swimming cap; before wearing it and squeezing it out. Removing the Speedos, I then, as a first for me, decide to fill up my once-white socks. Not normally a foot person, but that was a pretty good feeling! Finally, I decide the only thing left to do is to lay down in the mess, and as you can imagine, finish things off xd
all in all, one of the most fun little sessions I've had!