- Wear a mask so you don't ingest the dead mold spores & product
- Protect your eyes and skin from absorbing the mold killer product
- Spray MOLD PRO on any mold you see on the grout
- Once you've sprayed the MOLD PRO on the mold, leave it for 5 minutes
- Agitate the grout with water and a grout brush
Products used are here.