Rotajet spray washing and degreasing machines are used for washing aircraft wheels prior to inspection and crack detection. After a given time period or number of landings aircraft wheels need to serviced and tested. Aircraft wheels are typically heavily contaminated with brake dust, grease and oil deposits. Prior to initial inspection the wheels are washed in a two stage Rotajet spray washing machine. After washing the wheels are fully inspected and tested too assess if the wheels can go back into service.