Maybe! There’s a product that’s like alka-selzer for bottles. It works well for metal; I don’t know about plastic.

However, if it were me, I’d start with putting some baking soda in it and add some vinegar. That stuff will clean clogged drains, and I don’t think it’ll harm plastic. Vinegar is sold in plastic bottles, and maybe the baking soda interaction would damage it but I doubt it.

If you don’t want to take that risk, just try vinegar. It’s a pretty good cleanser all by itself.

Good luck!