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Try rinsing the area as thoroughly as you can with plain cold water. Let it dry,  and then spray the outside of the canvas with Fabsil silicone proofer.

In my experience, spray on waterproofing lasts about 3 seasons, but it does depend on the severity of the weather you experience

Ian

Just some further points about fabsil if you're going to do the job away from home.

It's bit smelly when it's first applied if you're going to sleep in the unit immediately afterwards. Might be as well to check with the neighbours that they don't mind if the pitches are close. It also works better if it's given a few hours to dry before any rain/dew falls on it, so morning is the best time to do the job. It's also said to be damaging to the plastic that TT windows are made of, and grass doesn't thrive on it either.

Having said that, I first used the stuff 30 years or so ago and I've never had any trouble with it at all!

Ian