You also have fluids in a lessor amount in the ingnition coils, struts for those cars that have a rear hatch or on hoods, beer in the back seat, windsheild waster fluid (that may have been used), gas was said, but some have diesel, then some diesels have an oil in the injector pump, but some are from the engine oil pumped into them as well as diesel. Grease in the ball and U-Joints, CV joints have a light grease in them. All the sealed bearing like wheel bearings and the like have a different grease...
Oh yeah, and when ever I have had gals in the truck for a trip, they are full of fluids that need to be drained every time I get a good pace going...