Do it right the first time; don't do it twice. Sure, you can blow it down farther down the drain, but do you know where it stopped? Did it come out the tube? Did it make it out from the inside of the fender? I just took off both my fenders. It wasn't that bad, and it was the first time I've ever taken them off. But whichever way he winds up doing it is fine with me; it's his Z :)