I would run iodaphor solution through it, after the PBW.
Why IO star instead of starsan? I cannot find much information on iodophor other than it doesn’t foam as much and can tint your lines after heavy use.
Is Starsan sufficient? It’s cleaned my carboy just fine.
It was already answered by a couple of my friends, but Star San is good at killing bacteria, not so good on Yeast, Brett (wild yeast), or mold. You can do internet searches and find guys who wash their yeast with Star San, doesn’t kill the yeast. That is why I said use Iodophor for sanitizing, after cleaning with PBW.
I had some kegs that went To a Brett taste and lots of pressure and foam. Star San didn’t do the job. Iodophor did. Oh, and I boiled the posts and poppets to be sure that Brett was dead in the nooks and crannies. The bugs and critters can’t take the heat.