Probably just some drips/splashes that the mechanic didn't clean up very well. As per TreeSemdyZee, it can take quite a while to get all the smell out. As long as the smell doesn't get stronger (more fuel leaking into cabin area), you should be OK. Parking in a warm, breezy spot (outside on a sunny day) with the windows down will help get rid of the smell sooner. If the smell gets stronger, get a pro to check it out.
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