Is there any thing I can wash my caravan with to stop black streaks appearing??
What we do is to give our caravan a good wash and then spray the whole caravan with Fenwicks overwintering fluid and then let it dry naturally. When then use a product called The Streaker. The Streaker is a length of silicon strip that fits in the awning channel on both sides of the caravan. These silicon strips prevent black marks from forming. They really do work. We did a product review on The Streaker which you can read on our website.