I can vouch for the waxoil every year I now use a thick piece of wire to clear the drain holes out. I couldnt understand after the first year I had drenched the sills in waxoil why I had what seemed like a tidal wave in the driverside sill slooshing about. AS I relieved the front sill drain hole with firstly a screw driver then a piece of stiff wire ,it was like breaking a dam.