the "rust punch" as shanebo called is actually better for paint, BUT if you have any loose electrical connections, or ones that do not keep out the weather very well it WILL destroy all of your electrical connections. it has adverse effects on copper, tin and zinc. the trucking industry has been telling truckers after they go through an area that has roads treated with it to thoroughly clean all light and trailer connections. i have Friends who drive trucks and they have to replace connectors almost yearly because of this. just keep your connectors clean and dry, of waterproof them and you should be OK. LAZ