The RMR-86 Instant Mold and Mildew Stain Remover is designed as a high-potency solution for oxidizing organic stains on contact. Built with a 15% active sodium hypochlorite threshold, it is significantly more concentrated than standard consumer-grade bleach products. This makes it particularly effective for deep penetration into unfinished lumber in attics or crawlspaces, where visual results are often achieved without the need for manual scrubbing.
The product is housed in a sturdy HDPE bottle, which provides excellent resistance to the caustic formula. However, the high vapor pressure and alkalinity (pH 12.0 to 13.0) place significant stress on the application hardware. Practical reports indicate that the trigger sprayer may seize or leak before the bottle is fully empty, as the internal components are susceptible to chemical degradation. Additionally, this strength requires users to be mindful of surrounding metal hardware, such as hinges or drawer pulls, which can be etched if accidentally oversprayed.
Users should plan for significant airflow during application due to the intense off-gassing associated with industrial-strength cleaners. While the speed of the formula is its primary benefit, the stability of the active ingredients naturally declines after six to nine months, suggesting it is best purchased for immediate projects rather than long-term storage in a cleaning caddy.
For those looking for a complete system that includes both a remover and a preventative barrier, the RMR Brands Prevention Kit Bundle provides a multi-step approach.
Organizing your cleaning supplies effectively can help extend their shelf life, and you can find more targeted options in the mildew and mold cleaners category.
