Buy reusuable furnace filters. These you can put in your shower/bathtub and rinse the the lint and dirt off or take out to your yard and use the garden hose to rinse the dirt off. Allow to drain and dry before spraying with Lysol and reinstalling. (The Lysol is to kill any germs or in the air). We've had ours for about 10 years and they're still good.
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