I noticed a ladder screw is rusting terrible and staining the concrete. Also, the gas line that is exposed from house to heater is rusting badly and that has an enamel coating on it. Any ideas on what I can put on the screw to coat it and keep water off it-petroleum jelly maybe? Is it OK to clean off the gas line with naval jelly maybe and repaint it with Rustoleum? The pool is only a month old!

Thanks!