The answer is simple. After years of development and in field testing on hundreds of jobs, we have found that using RMR-86 offers superior mold removal. Simply spray it on with a standard sprayer on any nonporous surfaces with mold growth and stains are gone within 15 seconds. No more sanding and wire brushing which means you make more money on labor costs. So if there's one new product to try this year that's going to make you more money on mold remediation jobs, it's RMR-86. A must buy!!!