I have a pressure washer I got from halfords or somewhere like that. Its an RAC branded one. Its pretty useless to be honest.
The fittings on the lance are made from plastic and they wear out and leak water everywhere. Plus the force of the water jet is not very strong.
Your only hope in that price bracket may be fleabay. The ones that are any good tend to be £150 plus - the rest are often like using a pump-up killaspray. I noticed ALDI are selling one. Can't vouch for its effectiveness but was reasonably priced. Karcher ones are hard to beat and sometimes they come up in special offers elsewhere.
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Really?! There's a HUGE amount of muck under the van (not sure its been cleaned under there...) and I dont really fancy getting on my back and shifting under the van with a sponge!!