just did my teak
i just refinished my exterior teak this week. previously i had used starbrite cleaner and brightener with an oil finish. it looked ok ititially, but looked crummy within no time. this year i asked the yard foreman, who does complete refurbs on some nice boats, and he told me to throw away the starbrite. he gave me a product called te-ka it comes in two parts, "a" and "b". it cleaned the teak increadibly and then brightened it to a beautiful blond color. be careful, it is some caustic stuff, u need lots of fresh water on the glass around it to prevent stains. i used a stiff scrub brush to work it in and watched the oil and dirt litteraly bubble out of the grain.it will raise the grain a bit, but a little sanding will smooth that. he recomended that i finish with cetol marine light. my god, it looks like it came off the show room floor and it is an '88. from what i understand, next year will require a lot less work, maybe a coat or 2 of cetol and i will be good to go. they also said, never, never, never, use varnish on teak. good luck.