Be sure to avoid parking near areas where secondary water from sprinkling systems can come in contact with your vehicle. The solids and sediments from secondary water, if allowed to remain on your vehicle's surface can cause hard water spots which prove to be very difficult to remove. If you notice your vehicle has come in contact with secondary water, be sure the sediments left behind are washed off immediately, especially before the sun's harmful rays are allowed to bake them onto your paint. Thanks for your business. Remember to wash every 7 to 10 days. Happy washing from your fast, friendly, and affordable neighborhood carwash.