What exersizes can i do to make my grow please help?

There is no exercise or pills that will help you grow down there, only time will tell how big you will be. You should wash it with whatever you use on your body like soap or body wash, just remember to keep it clean due to germs and no it does not do anything for growth if you sleep nude. If it did i would be over 8ft tall by now. Hope my answer was helpful?