Heat 1/2 C White Vinegar in microwave for 90 sec. Pour into spray bottle. Add 1/2 C BLUE Dawn Dish Soap. Shake gently to mix. Spray on surface and let sit 1-2 hours. Just wipe it away and then rinse with water.
How to get your dirty whites clean again... HOT HOT HOT water, 1 cap of laundry detergent, 1 cup powdered dish washer detergent, 1 cup bleach, 1/2 cup borax. Tell you what, you have to rewash it once to put softener in but it's the whitest you'll ever see your whites. If you omit the bleach it works great to get stains out of colors too (baby spit up is no longer a stain on OLD clothes)