I had purchased the acrylic hand for practicing henna design. I applied henna in it but the color is not going. Please provide a solution to clear the color from it or else it won't be of any use to me.
Hydrogen peroxide can work to remove it, you can also try lemon juice 1:1 with baking Soda after the peroxide. Strong hydrogen peroxide is likely to be more effective but not too important, it is highly reactive so make sure you clean thoroughly with a cloth before using it.
Depending on the type of plastic you can try strong acetone. However note that acetone will react with and melt some plastics and it is also highly flammable.