Using these Billetworkz engine bay caps is super easy. Just remove the old caps from your Subaru WRX (2015 - 2024) and replace them with these new ones. They're direct replacements, so you don't need any special tools or skills. For maintenance, keep them clean. You can use a mild soap and water solution to wipe them down. Avoid using abrasive cleaners as they can damage the anodized or powder - coated finish. When it comes to storage, if you ever need to take them off, store them in a dry place to prevent rusting. And always follow the warning instructions at http://www.p65warnings.ca.gov.