Hi all, wondering for those who have FRs and visible dual, Cupra twin (or those who have aero bumper twin exit) exhausts. How do you guys keep them clean / polished? Just a sponge and water with detergent every month? or we need to use special liquid we can get from auto shop (Halfords in UK in my case). My old car had 'hidden' exhausts, so out of sight, out of mind 