Using these side skirts is easy. First, use the included fitting kit to attach the side skirt extension splitters V3 to your Subaru VA WRX/STI. Make sure to follow the instructions carefully to ensure a proper fit. When you're done, stick on the Flow Designs stickers for that extra touch. As for maintenance, a simple wash with mild soap and water is usually enough to keep them clean. Avoid using abrasive cleaners as they might damage the hand - polished satin black finish. Also, be careful when driving over speed bumps or rough roads to prevent any unnecessary impact on the side skirts. With a 10 - year warranty, you can have peace of mind knowing these are durable products, but taking good care of them will make them last even longer.