"Metso" sodium metasilicate successfully removes these pitch deposits. A typical procedure is to empty the beater and fill it with hot water (150-160'F). Eight ounces of "metso" pentahydrate sodium metasilicate per gallon of water are added and the solution is allowed to soak for 24 hr. After draining, the beater is rinsed down. Pitch deposits of as much as 3/8'' thickness have been removed by this method.
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