I used TLC Auto Detail -
http://www.tlcautodetail.com/
They're located in Herndon, a guy named Dave runs the business out of his garage. I drove my car there, then Dave drove me to the Herndon P&R where I took one of the buses back to Arlington (5A to Rosslyn). Dave also offered to pick-up my car from Rosslyn and drop it off when done, but I didn't feel comfortable having someone drive my car that distance. The Opti-Coat cost $600.