Using your Axis Parts OLM LE Dry Carbon Lower Window Sill Cover is a breeze. First, gather all the included items for mounting. Carefully place the cover on the lower window sill of your WRX or STI (2015 - 2021). Make sure it's properly aligned before proceeding with the installation. When it comes to maintenance, use a soft, dry cloth to wipe off any dust or dirt regularly. Avoid using harsh chemicals or abrasive materials as they could damage the carbon fiber finish. Also, be aware that because of its production origin, if it's shipping from the factory, there will be a 6 - 8 week delay, so plan your installation accordingly.