Spray it where you suspect. The bubbles climb out right at the leak, in seconds. No tub, no rolling the assembly across the shop.
A slow leak is invisible air leaving an invisible gap. Chasing it by feel burns a bay and earns a comeback.
Bead, valve, sidewall, TPMS. On the car or off.
Bubbles rise at the exact point air is leaving.
The one that's actually leaking. No comeback.
Foams on contact, before any air moves. The leak is just one bubble in a field of suds.
Low-foam. It lies flat until air pushes through, so the only bubbles you see are the ones at the leak.
The one-pound-a-week leak before the comeback.
Test the seal in place. No dunk tank around the sensor.
Corroded bead seats show themselves the second you spray.
Confirm the patch held before it leaves the bay.

A leak detector engineered for the bay, not borrowed from the dish sink. Spray it, read it, wipe it, next wheel.
Straight talk: yes, it is water and a surfactant, same as every leak detector worth using. The engineering is in the foam control, so it points at the leak instead of burying it.
The page already makes the case. This last station gives a supervisor the proof, the shop math, and the link to send without repeating the whole story in three floating boxes.
Put your own tank time, re-checks, and slow-leak volume into the meter. It reports cost exposure, not promised savings.
Open leak meterBubble Check surfaces the leak at the valve, bead, or wheel. The largest independent tire retailer in the country uses it.
See Bubble CheckSend this page to the person who owns the process.