I would wipe it try, and run the engine to see where it is coming from. You may have to replace a gasket, or you may be able to patch it for a quick fix using RTV. My T-stat hose leaked, after I tightened it the coolant pooled up stayed there until i washed it off, coolant does not evaporate like water so if you didn't clean it off you may have fixed the problem already.
Don't forget to
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first then ask questions later! The loose nut behind the wheel