You can spit on a finger & hold it over th valve stem, tilt it slightly & a bubble will form on one side. If the valve is leaking, youll see it almost immediately.
A spray bottle, almost filled w/ water, THEN add the soap, spray the bead on both sides, No Bubbles? Spray the tread. Still no bubbles? Hold your eyes open & spray th soapy solution in until youre crying.. Why? YOu may ask..
No reason, Im just mean like that...