Monthly trip to spray the weeds that grow in the cracks, usually timed with a showing or clean up.5. 

Unless the fire stopped on its own, there was a heavy amount of water being sprayed into the home and that brings additional damages & hazards that you need to be aware of (wood rot, mold, etc.)

You fix the leak, chop your walls open at the bottom to inspect, physical clear out the mold and spray surfaces with chlorine bleach and/or soaking agents (great stuff from homedepot.com) for absorbent surfaces.