Big difference already. I had to use two cans of Gunk foamy engine cleaner followed by Scrubbin' Bubbles (Dow bathroom cleaner). Then cotton shop towell wrapped around a sharpened piece of wood to dig into the fins on the bottom. I was getting it ready to paint, though. Once assembled, it really does make a difference. I did like you on the '79 last summer, and it looks so much better.