what do I do with these lines now

I just cleaned up the a/c lines before I start putting them back on the car. These are the a/c lines that run from the firewall down the pass. side fender to the drier and the line that runs from the firewall to the compressor. I don't know for sure but I think they are stainless steel. they weren't rusty, just dirty. what do I put on them if any to keep them like this. or do I just paint them aluminum or something. didn't know if there was some kind of coating that will keep them shiny. thought about shooting a coat of clear on them. what came from the factory or what have some of you guys done. Its on a 69 Valiant. Thanks,Bill