There are several ways to remove nail polish without using nail polish remover. Here are some methods:

1. Rubbing alcohol or hand sanitizer: Apply some rubbing alcohol or hand sanitizer to a cotton ball or pad and place it on your nail. Let it sit for about 10 seconds and gently rub it back-and-forth. Your nail polish should come off fairly quickly.

2. Vinegar and orange juice: Mix equal amounts of white vinegar and natural orange juice together. Dip a cotton ball or pad in the mixture and press on your fingernails for about 10 seconds until the nail polish softens. Then, pull down the cotton pad to remove the polish.

3. Lemon: Place a slice of lemon or lemon juice on your nails and let it sit until the nail polish softens. Then, use a q-tip or paper towel to rub the polish off using an upwards motion, avoiding the skin around your nails to prevent irritation.

4. Hair spray: Spray hair spray on your nails and let it sit for about 20 seconds. Then, use a cotton ball or pad to wipe off the polish.

5. Hydrogen peroxide and hot water: Soak your nails in a bowl of hydrogen peroxide and hot water. This may help soften the polish so you can wipe or gently file it away.

6. Toothpaste: Scrub your nails with a basic toothpaste or one that has baking soda, which is a gentle abrasive. After a few minutes of scrubbing, use a cloth to wipe your nail and see if this method has worked.

Its important to note that some of these methods may not work as effectively as nail polish remover, and may require more time and effort. Additionally, some household products may not be backed by research, so its important to use them with caution.