joll said:

but seriously, is it ok to get under the wheel arches with the jet hose/pressure washer?

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Of course. If you can get to it, blast it.

And what about the engine, surely I can't use it under the bonnet?

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You'll need to disconnect the battery first for safety.

the pump keeps stopping and I have to keep jiggling the nozzle

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First, see if your penetration is too deep! Insert the nozzle then withdraw it about an inch. If this doesn't work, then you may have a crusged pip or a blocked breather.

Cheers

Blippie