As Domestic Bliss says - never, ever a pressure washer. I use a brush (don't know what they are called) I use it on my car, caravan, and even her car (sometimes)
![Grin ;D](http://www.cleanitup.co.uk/smf/Smileys/classic/grin.gif)
The makers use a mastic and over many years it dries out, stick a pressure washer on it and you blow it away like dirt, the water is forced down the cracks and the caravan is deceased
![Sad :(](http://www.cleanitup.co.uk/smf/Smileys/classic/sad.gif)
However - the best bit - you can earn money cleaning static caravans or even just their windows. I knew a bloke who used to charge £30 to wash and polish statics and that was 6 years ago! Plus alot of them have patios to clean! In fact the guy I bought my first wfp set up from used it to clean caravans.
So you don't just have to look at just touring caravans - static sites near towns can have people who use them to live in and that is where the market is
![Cheesy :D](http://www.cleanitup.co.uk/smf/Smileys/classic/cheesy.gif)