I use AMSOIL BriteSide Miracle Wash Waterless Car Wash and Polish, spray it on and it wipes rubber deposits from track tires right off the car, would think it would do the same for cone marks. Also, on the porsche forum, guys like Mother's R3, but I have no experience with it.
Mothers® R3 Racing Rubber Remover
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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