I have owned a 50 ft ketch
for 15 years with a teak deck
, 6 inch teak
toerail and teak forest down below.
Teak decks are made to be grey if you don't want to replace them frequently.
Never, never use a brush on teak, never use a teak cleaner. If you like a red deck
then some light sanding
is labor intensive but it works.
Teak does not need to be oiled or ANYTHING else other than saltwater and a mop.
People ruin teak because they do not know how to take care of it.
Yes you can make it look new with cleaners and abrasives then applying oils but teak weathers naturally GREY. Of course toerails can be sanded then vanished or you can use Cetol for affect.