I wonder if some Dawn dish soap in the wash would loosen some of the grime from ONR microfibers. IMO, ONR leave some type of a residue on the surface. Personally, I find the Duragloss No Rinse car wash to be a superior product.
Boiling water is 212 degrees F. If that doesn`t melt a towel, I can`t see how a washer at 130 or even 150 degrees could damage the fibers.