Bath of little abrasive magnetic balls

One of the best ways of cleaning an object is to immerse it in a bath of solvent or cleaning chemical. But such solvents and chemicals can be bad for the environment, so we fall back on elbow-grease type cleaning. Obviously this is a bit laborious, so perhaps the object in question could be immersed in a bath of little abrasive (but not too abrasive - perhaps plastic coated) balls. A fast-occillating magnetic field is applied to the bath, which jiggles the balls, which clean the surface. As the balls are small, and act like a fluid, all surfaces of the object (including difficult to reach ones) would be cleaned.