the antifreeze is a bit much for jsut a grimy engine. i would reccomend simple green barbecue grill cleaner. let it soak for about 1-2 mins. too much more than that will oxedise the aluminum and cause it to loose it's soft sandblasted finish. then, take to it with a toothbrush and rubbing alcohol to wash away the dirty stuff. also, the wings shouldn't ding too easily. if it is an arf, don't be alarmed. arfs have notoriously cheap covering. bubble wrap isn't necessary, and if you manage to ding it with the bubble wrap on then you are handling it too rough. you need to be gentile with this junk and stuff. try a wing tote bag