Fill a microwave-safe bowl with 1 cup of water. Place the bowl inside your microwave.
Heat the water on the highest heat setting for two minutes to bring it to a boil.
Remove the bowl of water from the microwave and set it on a hot pad to protect your counter top surface.
Hold the empty Swiffer cleaning fluid bottle from the bottom. Submerge the cap and 1 inch of the bottle neck into the boiling water. Hold the bottle there for 10 seconds.
Remove the Swiffer bottle from the water. Place a rubber gripper over the top of the bottle and twist the cap in a counterclockwise direction to open it.
Fill the Swiffer bottle with 2 cups of white vinegar and 2 cups of water. Twist the cap back on. Secure the Swiffer cleaner bottle in the Swiffer according to the manufacturer's instructions.