If you have a build-up of mixed material, one of the easiest methods to remove gel nail designs is to first file off as much of the top layer as possible and remove any gems or stones that may have been used. Continue to cut out ten 3 x 3 squares of aluminum foil and soak 10 cotton balls in acetone. Place each cotton ball on top of your nail and wrap with aluminum foil to secure the cotton ball on your nail. Keep the cotton ball on until you are able to easily wipe off the remaining gel design.