HRM worn during a mud run?

Hey, I searched but didn't come up with anything. I was thinking about wearing my HRM for the Dirty Dash tomorrow. I didn't wear it for my first mud run, didn't want it to get dirty. But I was wondering if anyone has worn one, and what you did to keep it clean. Or did you do nothing and it was still fine afterwards? I though I could put the snap on part in a zip lock back before I snap it on, do you think it will still work like that? Maybe I'll give it a try tonight, see what happens. And also putting the watch part in a baggy and putting it in a pocket or shoved in my bra. Opinions? Advice? Thanks!