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Since there is a very good chance that the liquid drain cleaner will not work, even though it is not harmful to pipes, it will be harmful to the plumber, (and his snake), when he has to unplug it mechanically. If it does open the drain, it will only open enough space so the liquid can drain out and it will clog up again quite quickly. Call a plumber. And since it will be inside the house where a water jet could get real messy, he will use a snake to unplug it.