You'll probably need something to break down the oil in the diesel first, something like kerosene or white spirits, then use a good detergent.
As Simmy says it may take several attempts with a wet vac and try to obtain a foam each time to lift the diesel from the pile. If you have a houshold dehumidifier leave it in the the car overnight.
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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