I'm doing just this thing now and it has been a mess. Started out by sucking out 20 gallons of the top into 5 gallon buckets. I'm in the yard so I turned on the bilge pump and sucked down to the oil on top. Then i added 5 cans of foaming degreaser on to eveything i could spray. Soaked for an hour and blasted with a pressure washer. Let evrything settle and pumped out water undeneath once again. Now I'm doing sheets of absorbs about 20 so far and I'm almost done. PO knew he had a leak,just never cared to fix it. Never could understand people like that. Just be persistent and eventually you can come away with a white glove.
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