Using these Rally Armor mud flaps is easy. First, gather the corrosion - free stainless steel mounting brackets and hardware that come with the product. There's no need to drill holes or make any modifications to your Subaru WRX / STI Sedan from 2015 to 2021. Just follow the included instructions to attach the mud flaps in the right spots. When it comes to maintenance, a simple wash with mild soap and water is enough to keep them clean. Avoid using harsh chemicals as they might damage the flaps. During extreme weather, like very hot or cold days, don't worry - these mud flaps are designed to handle it. But still, check them regularly for any signs of wear and tear. If you notice any issues, contact the manufacturer right away. That way, you can keep enjoying the protection and great look of your Rally Armor mud flaps for a long time.