which leads to people NOT cleaning them and then puts me in my current position :
driving round to my girlfriends with 5 litres piddling on to my feet out of the heater ducting!
i couldnt help but laugh as i heard lots of gurgling and my feet just got wetter and wetter
needless to say i unclogged the mess, got about a dust pan full from each side!
lesson learned : clean out under your rain tray if you havent already.