Take some cotton balls, tear up into ten pieces and soak with acetone.
Use 100%acetone. Not just normal nail polish remover.
Tear some foil into ten slices.
Wrap cotton ball around shellac nail..
Take foil and start to wrap it around your finger tip
Fold the end so the acetone doesn't escape from the cotton ball
Repeat on all fingera
Wait about ten minutes and check to see if the polish began to lift from your nail
It will start to break down and peel off
You can start scraping off the loose polish
Here's another nail
If some polish is still stuck just put the foil cap back on for a few minutes
Scrape all nail polish off
Take a acetone cotton ball and wipe away any left over polish
And viola! Clean slate! File and buff to liking. Enjoy!