only thing cranberry juice does is keep things from sticking on the walls of the bladder,
Cranberry doesnt keep THCA from "sticking on the walls of the bladder" because THCA doesnt stick to the bladder walls to begin with. Whoever gave you such ludicrous info needs to do some serious research on human biology and THC. Such info is not needed on these forums where people with careers, families, and freedoms hinging on the outcome of a U/A.

Cranberry juice does nothing different than any other fluid - it temporarily dilutes the THCA concentration that is present in the bladder to where the sample registers below the cutoff thresholds of the assay screen. Dilution actions are only temporary - once all the fluids ingested had been all urinated out, a "dirty" donor will resume testing postive for THC.