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Thanks all. Redpicker: I was thinking the same thing about re-checking the results. We weren't thrilled with the method but weren't sure what else to do on a time crunch bearing in mind we couldn't do any destructive sample-taking.

Thanks for the quick responses. We'll do the same non-contact test (I'm not sure what process it is, we brought in a third-party steel mill's equipment to check this). While I'm not certain what the lead contamination threshold needed to satisfy the customer is, I can say it is lower than it is...

Requirements from our customer; we feel it's safe after our attempt at removal but they are requesting further work to be done.

I have a large steel structure (the surface of concern is ASTM A572) that has been tempered in an oven at ~1200 deg F. Accidentally, a considerable amount of lead was left on the surface before the heat treatment. The lead subsequently melted and contaminated the surface of the steel...