Drano is not recommended by plumbers due to its harmful effects on the toilet. It is meant to unclog toilets and it does but not completely.
Drano, however, produces large amounts of heat that damage the porcelain causing cracks that will eventually break. This is risky to anyone that will use this toilet because it can break down at any moment.
The heat also destroys PVC pipes which melt when exposed to such amounts of heat. Drano therefore could partially unclog your toilet but destroy the whole toilet in the process. It is ruled off completely as a solution to unclogging toilets.
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