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How to remove a henna stain
Mix equal parts salt and olive oil in a bowl.
The oil is an emulsifier, while the salt is an exfoliant, so the combination works well to get the henna off of your skin. You can use any kind of salt you wish.

Select from:
+You could use baby oil if you don't have olive oil. Soak a cotton ball in the mixture and rub the stain with it.
+The amount of olive oil you use depends largely on the size of your stain. For example, if you're using a 7.5-ounce bowl, dump enough olive oil into the bowl to completely saturate the henna stain.
+Make sure the mixture is clean and contain enough oxygen bleach. Try to use witch hazel instead of white vinegar to dissolve the henna.
+You'll need a different one for a variety of reasons. On the other hand, just a combination of both will work to remove the henna and make the stain come off easier.
You could use baby oil if you don't have olive oil. Soak a cotton ball in the mixture and rub the stain with it.