I was worried about sanding through the "veneer" on the floor on my Bristol. Turns out, it is 1/4" thick. It's a little thinner on the Bruynzeel teak plywood bulkheads.Also, I get the impression that teak veneers have gotten much thinner in recent years. Try what others have set. Start gently and then work your way up to more aggressive cleaners if you are not happy with the result. The two part cleaners are very effective and you don't have to scrub, which is good for the grain, but they are very powerful chemically - sodium hydroxide and a mixture of acids as I remember. On veneer I would be very careful with that stuff though.