Not all polymers react to acids the same way. I am far from a chemical expert, but deal with plastics and chemical resistance in some of our products. I would recommend either DuPont's chemical resistance guide (online, but must register) or a google search for chemical resistance. Yeah, the stuff comes in a plastic bottle or jug, but your system isn't made of the same stuff as that jug.
FWIW, there are plenty of alternatives to HCl, such as limeaway, vinegar, and muriatic acid. All will eat mineral deposits that are a common result of all but the purest of distilled water. Also, even though an acid may not "eat" a plastic, that doesn't mean that it has no effect. Some plastics become embrittled and may fail later. Something to think about. . .
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