Just bought a 328iS Coupe, problem i'm havin is the one touch window close is misbehaving. When i try close the windows they get half way up then come back down. Someone suggested this might just be the rubbers gripping them and they need to be lubed. Does anyone know if this is the case and what would be a good lube(i.e. nothin greasy cos will be in contact with the glass). Thanks