Wool is an amazing fiber and is one of the finest face yarns available for carpet. It has excellent soil-hiding and release characteristics. Wool holds dye to the core of its fiber, and you may see rugs in museums with brilliant colors, which are well over a hundred years old. This bond with dye also explains the difficulty of removing any stains with dye additives. Wool is also sensitive to alkaline chemicals over 9.5 pH after prolonged exposure. Wool organizations recommend that a pH of 4.5 to 8.5 be used when cleaning wool fibers.
Wool Area Rug Cleaning