heck yeah...
1. rinse them clean, immediately after use (i mean rinse them really clean).
2. wash them out in soap and water just like any other material.
3. rinse them clean again... really, really, thoroughly.
4. pour boiling water over them in a pan and let them sit in it for a while.
5. hang them up to dry.
if you are using them for BIAB, it's going to be boiled anyway.
if you are using them for dry hopping, or something, boil them just before use.