You’re welcome! And thanks for the great questions. We have linked to a video that explains how to make your own solution – let me know in case you can’t see it for some reasons. I haven’t tried that method yet, but the process seems very simple and you only need kosher salt, white vinegar, a scale, and pH testing strips.
With regrads to using it on colored fabric, FoN claimes that “[…] you can use it on rugs & carpets, where it’s as effective as Resolve, but without harmful chemicals. Always 1st test for color-fastness in an inconspicuous spot & let dry before proceeding.” Anectodally, I’ve been using it with colored microfiber cloths only and never had an issue with it, but there is some evidence that it might stain some fabric.
If you test it on other types of fabric, I’d love to know the outcome (just be careful!) – I’m sure that other people would find that info useful – and I’ll do the same!