Carburetor cleaner seems to be a regional sort of substance, like fine wine. I think the stuff sold in California lacks the aggressive solvents required to dissolve the worst of the crud out of the pivots of a grandfather clock. At least that's what I've used it for, though only in emergency situations, for it's a poor way to clean a clock.
As suggested, however, a non-flammable brake cleaner will be equally effective in detecting a vacuum leak, for it'll simply slow or stop the engine.
Full disclosure: it took me years to find a dumb vacuum leak that plagued the engine of my beloved (and under external restoration) 1964 Econoline van. Some things are not apparent to even the most mechanically-woke mind, especially if it's on your own truck. (It was a bad PCV valve hose. Sheesh.)