Depending on what type of bearings you are running is how you should clean bearings. Sealed bearings in general are not waterproof some what resistant. There are special application *WATERPROOF Bearings* you can purchase for your application which in this case you can use water to clean but other than that it is generally not a good idea to clean *sealed* bearings with water especially pressurized or submerged, as they will enter the seal. Most general application sealed bearings usually would only resist dirt,dust ect..so it would not form into grit when mixing with bearing grease in turn will ruin/damage the bearing. There are many types of bearing cleaners and lube out there for our application.