Yes, brush + knock off all the dirt that you can, then soak it in bleach water + give it a scrub. Rinse very well with hot water, then after it dries for a bit pop it in the oven [ if it fits ] for an hour at 250F.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!