We starting using Pureworx as a prewash stain treatment for mysterious stains. It worked so well, it has become our go-to stain pretreatment. We always patch test and, so far, we haven't had a problem with any fabric we've used it on. Considering how harsh and hazardous many laundry chemicals are, Pureworx is an amazing product for us as it is effective and safe to use.
Eco Wash n Go