my personal favorite is autoglym caravan cleaner £5 a large spray bottle,from my local market a bit dearer from caravan shop.i highly recommend this stuff,it does black streaks,windows upholstery, and many other uses.a little spray goes a long way.
I have just started to use Autoglym but found that it has streaked my van.....I used normal car polish previously with no streaking.....The streaks are all over and not just when the joins/windows/seals are. I think I'll go back to the normal polish.
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