Originally Posted by goodname4id
If submerging the tire is not an option, try spraying the tire with a soap+water solution in a squirt bottle. (like an old glass cleaner bottle) I once found a hole in a tire 2 inches up the sidewall where an object had pierced the tire and pulled out leaving an almost undetectable leak far away from the tread surface.
first place I would spray would be the valve stem.
I agree. I use dish soap and water works everytime. One quick way to check the valve stem is to simply spit on your finger and smear it on the valve stem and watch for bubbles. Yeah, gross maybe but it works.