I had two little ones go through this phase as well, and once only with poop. Thank God in my case it was solid little pebble poop LOL. Hydrogen peroxide is an amazing antibacterial cleaner as bleach will ruin the plastic.

The only thing that worked for me was to stand at the door and if I heard them move I would slowly open the door to see what they were up to. If they started to strip I would say no thank you and put there stuff back on and put them back to bed. I had to repeat this process at least 5 -8 times before they got the message; it was 2 days of back and forth at naptime. They need to know you mean business and once they understand they will get back to routine!

Good luck!

P.S can I marry your husband too! Mine would never sign up for poop clean up not even if I were
Angelina Jolie.