In Reply to: Please help!........LEAK..........(more) posted by Greg in AZ on October 06, 1999 at 16:06:19:
You could use the Redneck Litmus Test to be sure. Take a piece of white paper and soak a corner of it in the puddle. If the resulting area is other than clear, then you're probably dealing with other than water. If you're still uncertain, take a lighter and hold it to the wet area. If it nothing happens, chances are you have AC condensation. If it ignites, you've probably got petroleum of some sort.
Be very careful where you try this--a ventilated area away from combustibles is a must. A friend of mine sent his lawnmower and a good portion of his left hand through his garage wall performing this test.