It's just the ketchup. No need to rub or scrub.
A thick layer of ketchup as it can be seen on the picture will do the magic trick.
Small discolorations can be polished after that. I used Nevr Dull.
Appreciate the info! By the way, i just checked Amazon and the Eagle-1 version of Nevr-Dull is about half the price of the original Basch Nevr-Dull. I looked up the difference and apparently they are the same exact thing made by the same company. The Eagle-1 version is just marketed to the auto enthusiasts. Gonna get it right now. I remember using this stuff when I was a kid in my grandfather's garage. Thanks so much for the tips!