Two artificial soils were most effectively removed from wool in an impeller-type machine, but, considering their greatly different effects on felting rate, the differences in efficiency of all the machines studied were relatively small. A rotating-drum machine was almost as good as the impeller-type for removing a particulate soil, but was worst of all for an oily soil.
Soap removed the oily soil from both untreated and shrink-resist-treated wool more effectively than did the synthetic anionic detergents, but the order was reversed for the particulate soil.
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