This is one that I would give it a Dawn wash since it’s been sitting outside for so long. I don’t recommend Dawn for anything except reclamation projects where the owners have neglected vehicles for years. Dawn, Iron-X, then rewash with a good car grade soap, then clay. After all that the contamination should be mostly gone. You may need a tar remover to get the tree sap off, always wash after using a tar remover.
Enjoy that diesel for another 200,000 miles!
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