I've just got a scaffold piercing and I was wondering how long until I need to start cleaning it?

Oh, you mean you got your industrial done! Okay, i got' cho. But you can use a sea salt solution, which basically is just a gallon of hot water with about 4 tablespoons of sea salt, and it HAS to be natural sea salt, not just table salt. You should start cleaning it right away so it doesnt start to get infected.