Id leave the strakes bare, occasionally strip them with TSP (trisodium
phosphate) and then bleach with oxalic acid ...... then occasionally
I'd apply a 'resinated' teak oil. If you cant find such, then buy a
tung oil based teak oil and mix in 25% oil based varnish. Apply 3
heavy coats, just slop on with a foam brush.

Will last for a season or two, easy to resto scrub with TSP to
lift/remove the old oil and then wipe on new.