The following resources describe the proper procedures for cleaning basements concrete block, brick and poured concrete surfaces. Essentially, remove mud and debris, scrub the surface with soap and water, then disinfect. Be sure to use personal protective equipment such as a mask and goggles.
Mold Clean-up After Disasters: When to Use Bleach
https://www.cdc.gov/mold/mold-cleanup-bleach.html
Rebuild Healthy Homes: Guide to Post-disaster Restoration for a Safe and Healthy Home
https://www.hud.gov/sites/documents/REBUILD_HEALTHY_HOME.PDF