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Just wondered if any of you guys knew of anything to stop the aluminium bottom exterior rail of the windows "excreting" balck stuff all over the side of my motorhome. Obviously only a problem when it rains but it leaves one hellavuh mess on the side of my van.

Is there anything that can be treated onto the ally to stop this??

Hi Boggy welcome.

Try doing a search on the caravans forum as I'm sure this has been mentioned in the past on there - put "black streaks"

'fraid I can't remember what the solution was.

are you sure its not rubber thats perished and leaving black streaks,

best for ali is a rub with vaselene.

HI

I hope the rubber aint perished the vans 4 weeks old but I will try vaseline (better ask er in doors were she hides it)

I believe Vaseline is a petrolium based product that does perish rubber - If I am wrong someone will trounce on me no doubt! LOL.