Oil cap left off after change

We took our ‘21 in for an oil change. My wife said it smelled really bad and was giving her a headache. She called the dealership and they never returned her call. I figured they just spilled some oil and it would burn off. Today she said it was worse. I opened the hood when she got home from work, and they left the cap off. Oil all over the place under the hood.

Replaced the cap and now wondering what issues this could cause? Now or down the road? Will it all just burn off or should I expect they are going to clean it all off? Any specific components I need to be worried about?

She is bringing it in tonight and they’re giving her a loaner car, but wondering what the appropriate cleanup should be from them.