But don't use rock salt on concrete. It will ruin concrete, causing it to chip, fragment, and flake. Rinsing is very important. Always rinse afer you use bleach or rock salt. But be aware that in a flood situation, some sources of rinse water may be contaminated.
Trisodium phosphate is found in some cleansers.
It cleans but it will not disinfect surfaces that have been contaminated by floodwaters. Hazardous fumes will result.