RR-10 â?? RR 10is a compound based on phosphoric acid so itâ??s a safe rust remover. In RR 10 phosphoric acid is inhibited by German inhibitor Korantin-PP and contains detergent to help in removing oil or grease on the components. Since RR-10 is a controlled acidic media hence removes rust only and donâ??t attack steel or iron components. Hence keep the components dimension intact.