I've been used Semco before and didn't expect the other cleaner will change my mind. But it's hard to find Semco I SEA.
Justteak was recommended by an Australian couple who live in the same marina said it's good product and cheaper!
We tried it on our teak swim platform first, it is very easy to use, scrubbing with a brush. Scrub with the cleaner, rinse, scrub with Brightener, rinse, let dry and then it looks like I have a new boat! We went back to your shop again to get a gallon. Soon I'll try your teak sealer!