When I bought my car, the washer bottle would leak when it was on the full side out the vent behind the passenger side headlight. I figured it out after a while and put a screw in the end of the vent hose. It fixed the leak but I'd always have to take the screw out or suffer a very slow fill. Today I fixed that by putting a brass fitting in the end of the hose, with a couple more to make a complete U-turn, ran a hose over to the fill neck, and put another brass fitting in a drilled hole near the fill cap. No more leak or slow fill!