HELP. My 4 year old sleeps in a pull-up and wakes with it full of pee every morning (fine with me - he is not ready for night-time potty training).

The problem is, his bed, sheets, and really his whole room just REEKS of pee all the time! It is so gross. Washing the sheets helps, but I don't have time to wash his bedding every day.

Anybody have any hacks?