Gary,
The acid based coffee stain removers don't need HWE. The encap cleaning has been working fine to clean after treating the spots. And like Tom mentioned - many of these stains will even come out by simply scrubbing them with an encap detergent (I had a couple of distinct brown coffee stains on the job that I did tonight that just scrubbed right out). Only the bad ones will require coffee stain remover.
Although you may already know this, it’s good to keep in mind that some coffee stains may be permanent. This can be a problem depending on the dye method of the carpet. For instance, vat dyeing is where the fiber is dyed in a vat with hot dye. The hot dye opens up the dye sights. As it cools the dye sights close and the color is contained. Acid dye blockers are also added to many carpets to reduce color staining. Yet if coffee is scalding hot when it gets dumped onto the carpet, the dyeing process can occur all over again. It's possible that the scalding coffee can enter the dye sights and cause a permanent coloration. This is not uncommon, especially in areas where a hot coffee pot or coffee urn is in use.
Rick Gelinas
