Goal and options: how do you keep betas from fighting?
output answer: do not put two betas in the same fish bowl.

Goal and options: how do you quarantine something?
output answer: keep it in a room by itself completely

Goal and options: How to remove a set in (washed and dried) oil stain on clothes.
output answer:
First put a piece of cardboard behind material with stain, then spray stain with WD-40, poor a lot of baking soda over stain and scrub scrub scrub and repeat process (less WD-40) again and again, then pre-treat with dawn soap then machine wash.