1. Use a clean cloth with water or baby wipes to wipe around the penis and scrotum. 2. Make sure not to retract the foreskin as forcing it back may cause a tear and issues for him later on. Penises are self cleaning, so you don't have to make sure it's squeaky clean or anything. http://www.babycentre.co.uk/a115/caring-for-your-babys-genitals
For each diaper change, ill use baby wipes if im out and if im home ill take him to the toilet and rinse with water. I dont use soap unless he did a poo or during shower time. Clean water ia the best, whether kids or adults. Just clear water and wash lightly.
thanks