How to Kill Mold with Borax
To kill mold using borax, create a borax-water solution using a ratio of 1 cup of borax per gallon of water.
Vacuum up any loose mold with a HEPA filtered vacuum cleaner to lessen the number of spores stirred up into the air during the cleaning process.
Use a scrubbing brush with the borax-water solution to scrub the mold off the surface.
Wipe up any extra moisture and excess mold particles or dust/debris to prevent them spreading into the air once the surface has dried.
You don't need to rinse off the borax as the solution will prevent more mold beginning to grow on the surface again.
Leave the surface to dry completely.