Suggest that you leave the cover off, refill any missing oil and then clean it with scrubbing bubbles bathroom cleaner or better yet Oil Eater (only on cool engine!!) and when dry leave the hood up and try bringing the engine up to operating temp and RPM and watching the bay for a good 15-20 minutes. Also keep an eye on it after shutdown for a good 15-20 minutes in the off chance it spits afterwards and gets spread upon next start up.

If you lost a lot of oil you should be able to see it quickly, but if it was a small amount then the above should help.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course