I purchased a product from ZEP that is supposed to do this in just a few hours, soac with no pre cleaning then power wash off. It cost about $60 for a 5 gal bucket plus $40 shipping, haven't had a chance to use it yet, they only sell to companies and a cat dealer uses it on machinery here in town. I ordered it through my construction company name with no epa problems
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69 455/4-sp windward blue under major restoration
69 400/400 waiting for resto
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