If they steam-cleaned the bay, it's probably as good as it's going to get, within reason. I'd be more worried about dirt and crud that fell into your engine with that cap off for 1,500 miles. It would be a good idea to do a full oil+filter change immediately, and maybe add an oil cleaning additive of some kind for this change. Just go to the dealer that screwed up with the cap and ask them to do that for free in return for leaving the cap off, imho.
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