Buy this book
It may look like a coffee table book but it really is the definitive work on brightwork. "Brightwork" by Rebecca Witman. She will tell you everything you could want to know about brightwork.My opinion: Use Teaka A&B teak cleaner. Use lots of water around the gelcoat cuz it can bleach the gelcoat too. After it's all dried, sand the wood down so it's smooth, no major outstanding grain. Now comes the tough part. You have to decide on the finish. Personally, I'm a varnish slob & think Cetol looks horrible. It's very orange and painty looking. On the other hand, maintenance is reasonable (a coat a year or so). Varnish is gorgeous but takes committment to maintain it. There are other products out there probably work beautifully as well so you're going to have to do some research on it. If you're going to go for the Cetol-type product, I'd suggest looking into Armada as it's not as orange. Cetol-lite might look better too but I haven't actually seen it. West Marine also has a product called Wood Pro which is similar to Armada. All I can suggest is to look at as many finishes as possible before deciding on one, cuz once you apply it, it's there for awhile! Nothing worse than applying something and finding out you hate it.LaDonna