These are what I've settled on. Hay and poop don't stick, they just shake right off.

https://www.amazon.com/DOZZOPET-Washable-Absorbent-Waterproof-Hedgehog/dp/B098STWNMM/ref=mp_s_a_1_3?crid=R07J2KLBFA4Z&keywords=dozzopet&qid=1650479224&sprefix=dozz%2Caps%2C171&sr=8-3