Balsa and rigid foam cores. Aluminum, magnesium, and titanium alloys. Epoxy resins. Unidirectional glass, carbon fiber , and Kevlar. Builders have the most fantastic tools at their disposal to build light, durable boats … and then we weigh them down with all manner of stuff.
When applying a paste cleaner, a toothbrush is useful for buffing tight spots and working into the pores of welds; follow by buffing with a cotton cloth. A green 3M scrubby pad helps for removing more aggressive stains. Continued rusting in welded areas might indicate a developing failure, requiring replacement. Rinse thoroughly with fresh water and mild soap when done buffing.