No matter the condition of your 2004 CTS, OPGI has the Cleaners & Degreasers you need to boost performance and get you back on the road. We currently carry five Cleaners & Degreasers to choose from for your 2004 CTS, and our Price Match Guaranteed prices range from as little as $14.99 up to $109.99. OPGI offers POR-15 plus zero other trusted brands of Cleaners & Degreasers for your 2004 CTS, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Cleaners & Degreasers in person.