Originally Posted by chucklesR
A useful tool when searching for leaks is the blue chalk dust you can get an most Lowe's or Home Depots - it's used to refill chalk lines.
Squirt some on the surface of 'whatever' - the leak's will create a track that is easy to follow to the source. A simple vacuum and wet cloth can clean it up.
Brilliant idea... just don't ever, ever, ever use red! Red chalk stains! It's banned from my jobs except for rough framing.