Why should you not use Liquid Plumber on a clogged toilet?

First of all, it’s best not to use any toxic chemicals in your plumbing system. Second, your toilet has big wax ring that seals it to the drain pipe. Liquid Plumber will eat away at that wax ring. Then, every time you flush about half the water will make it down the pipe and the other half will leak out across the floor from under the base of your toilet. If you have a clog, try to use a plunger to dislodge it. If this does not work, contact a plumber.