How to remove super glue from a plastic case?

I was putting rhinestones on a iphone case the case is white and plastic i tried nail polish remover (with acetone) and i tried warm soapy water but only a few 5-10 rhinestones came out and in total there's probably 20 rhinestones left is there maybe a product thats around 3$ or less? I just really want them to come off and i don't know what else to use the rhinestones are all glued next to each other

You could try a product like Goof-off or Goo-gone. They are both solvents made to remove hard to get off stuff and they will probably have a higher concentration of acetone than Nail polish remover. That said, I usually have to chisel or scrape off anything adhered with super glue.

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