Muratic acid has its uses, but I doubt it would help much with a clog from grease and clothing fibers. The conventional caustic drain cleaners might be more effective, but a snake might be best yet. Muratic acid will do a fine job on lime, rust, iron, and other active metals, but not much on other materials. I don't think it would have much effect at all on copper, PVC, ABS, or clay tile. There are safer materials for lime and so forth. One of the best is an oxalic acid based radiator cleaner. As Tom says, nasty stuff.
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