Yep, carb cleaner will damage polymeric and elastomeric ("plastic" and "rubber") parts. It contains active solvents significantly more aggressive than anything found in gasoline. This presents a dilemma when working with e.g. a Holley 1920: The metering block has a little nylon lever arm on it which actuates the power valve. The metering block needs to be soaked to get internally clean, but this lever arm must be carefully removed before soaking the metering block in carburetor cleaner, but after a few decades the lever arm can be quite delicate and brittle. Use a small jeweller's screwdriver to prise the lever off its hinge pin, work carefully and slowly, and don't sneeze!
Also be mindful that carb cleaner, particularly the highly aggressive yellow-brown dip-type stuff (e.g. B9 ChemDip, Tyme) will eat the protective dichromate coating right off the potmetal carburetor castings. They'll come out looking spanking, but without the protective coating they'll be much more prone to corrosion (especially with the alcohol found in many of today's gasoline formulations) that'll bring back clogged-carb problems with a vengeance.
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