What I have is a night box. We open the door in the morning and close it in the evening. My leopard tortoise spends about 6 hours outside mostly grazing. And he pees/poops in the backyard garden but also sometimes does it at night in its box
I remove my orchid bark substrate if it's bad and dump it all in a bucket of hot water and leave it like that for a day.
Next day I lay it on the driveway or a flat surface and spray it with garden hose with pressure.
All the sand and liquefied poop washes off and the orchid bark stays