Using these RokBlokz mud flaps is a breeze. First, gather all the included items: 4 black mud flaps with a blue logo, the stainless - steel and rust - resistant mounting hardware, and the fitting instructions. Refer to the instructions to find the existing OEM mounting locations on your 2022 - 2025 Subaru WRX. No need to drill any new holes. Just use the provided hardware to attach the mud flaps securely. As for maintenance, a simple wash with mild soap and water will keep them clean. Avoid using harsh chemicals that might damage the material. In extremely cold or hot weather, don't worry as these flaps are designed to handle such conditions. But always check the mounting periodically to make sure they're still firmly attached. Also, be aware of the warning link provided (http://www.p65warnings.ca.gov) for any potential safety information.