The Power Of Scouring And Agitation
The first reason people try this method is the physical movement created by the ice itself. Liquid cleaners can help with stains and smell, but they do not create the same kind of friction as solid ice moving through the bowl and trapway. When a large amount of ice is flushed at once, the cubes travel through the curved pipe and bump into the inside surfaces as they move. This can help disturb light residue, soft buildup, or bits of paper and grime that may be slowing the flush without causing a full blockage.
You can think of it as a gentle scrubbing action created by motion instead of a brush. Because the ice is solid, it can briefly push water through the pipe with a little more force and turbulence. As it melts, it disappears on its own, so there is no lasting object left inside the toilet. That makes it feel like a milder option for some people who want to loosen small bits of buildup without immediately reaching for stronger chemicals or rough tools that could scratch the surface.
