So I got three kegs and a CO2 tank about a year ago from my brother (he had been holding a friends homebrew stuff and the guy said I could use them), so all I had needed was a regulator and gas/beer lines. I was going to buy them online for roughly $100, then I was helping my brother move this past weekend and noticed that he actually had the regulator and gas/beer lines at his apartment, so he let me take them. Should I just buy new lines? Or can I clean these? How much are the gas/beer lines to replace? Any other maintenance that needs to be done on anything?