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All depends how bad it is ,for a quick clean use novus 1 ,if you want to get Most of the scratches out use novus 2 than finish of with novus 1 ,your can use novus 3 then 2 and 1 .
Another way is to take the ramp out of the game and but it in a dishwasher for a bit don't dry it in there as it will knacker it as it is to hot , not done this myself ,but over people do !
There is more ways to clean a ramp but this is the easiest
Wash the ramp with a soft brush in warm soapy water then flame polish it. Do not flame polish it unless it's 100% clean though otherwise you'll just get the dirt embedded into the plastic!