Please choose the correct ending to complete the given sentence: Health: [header] How to get rid of yellow nails [title] Remove nail polish. [step] Use a cotton ball soaked in nail polish remover to take off any nail polish currently on your nails. Simply rub each nail with the cotton ball until all of the polish has completely dissolved.

Ending1: [substeps] Some nail polish removers have a " go " or " side " switch for different colored nails. Since yellow nails tend to look rowdier, you may want to use both. Ending2: [substeps] You should never exfoliate your nails, as these may dry and cause significant damage to your nails. Try to wait at least three days after washing your hands before using nail polish remover. Ending3: You can also wash your hands with rubbing alcohol or hot water before removing any polish. [substeps] Make sure you wash and clean the nail polish in hot, soapy water prior to you begin and clean your hands once you've pulled off the yellow nail polish. Ending4: [substeps] In order to fully treat yellowed nails, the nails themselves have to be bare, with no layers of polish or varnish. Once all nail polish is removed, you can fully see the stained areas of your nails.

Answer format: ending1/ending2/ending3/ending4