i do reconditioning and detailing for acura and it is possible to get rid of it sure peanut buttter and vinegar works and so does rain-x and paint thinner but all of these are not good for your paint especially nissan paint depending on what year your x is you dont really want to mess with that stuff the oil in peanut butter will eat at your clear coat like paint thinner you see the one thing that makes these chemicals and foods work is because the all contain a chemical oil that acts as an emulsifier and removes stains but your best bet is to clay bar first and then have the area buffed by a trained professional at you nissan dealership with a compound wax and then have them hit it with an orbital and some velocity glaze. the compound wax has tiny grains of sand in it which in a way act like a clay bar but much faster and harder than you can rub by hand most delerships use these things so it shouldnt be a problem