I will be applying JB Weld to a small leak on an aluminum boat. (I think the problem is a loose rivet) According to the instructions on the package, I am supposed clean the surface where I will apply the JB Weld. The package states that the surface should be sanded down or grinded/filed. I don't wanna do that to my boat!! Has this product worked for others w/o sanding and filing? Will simply cleaning the surface work? If so, what's the preferred cleaning solution?