Using your Flow Designs rear spats is easy. First, make sure to clean the rear area of your Subaru WRX or STI where the spats will be installed. Then, use the fitting kit included in the package to attach the spats securely. It's recommended to follow the instructions provided in the fitting kit carefully. When it comes to maintenance, you can clean the spats with a mild soap and water solution. Avoid using abrasive cleaners as they may damage the hand - polished satin black finish. Check the installation periodically to make sure all the parts are still firmly attached. If you notice any issues, don't hesitate to contact our customer service. Remember, these spats come with a 10 - year warranty, so you can enjoy peace of mind while using them.