The invention disclosed defined a vertically extending passage through the rotary center of an inner cup or the rotary center of a spinner in a notary chemical treater, disposes a stationary cleaning fluid nozzle in the passage, and injects the cleaning fluid from the nozzle to clean a lid of the rotary...http://www.google.com.au/patents/US5591262?utm_source=gb-gplus-sharePatent US5591262 - Rotary chemical treater having stationary cleaning fluid nozzle
