Vacuum with the bristle brush head of a wet vac when dirty and dry, use finger nail to scratch off what brush won’t detach. Slightly open top and vacuum in the vert well, open some more and vacuum well in the well, clean with vacuum brush and fingers and rags the pieces that hold the window in the grooves as well. When washing car use water nozzle on small defined hard spray., no soap or rags and don’t dry it