You guys do understand hes in NY and the temps are 10-30s over there...AC leak? I mean I highly doubt he will put the AC on.
My bet is either a oil leak or washer fluid like many said. Best thing is to put some cooking trays underneath and find out. (you can get like 3 for 1.00) Its easy to tell coolant washer fluid and oil. Washer fluid will be blue or orange depending which one you used. Coolant will be green or blue depending which you used and it will be a very hint of blue not like washer fluid. Oil will be brownish and sludgy. People do taste it lol