Twice a year we use the white 3M scotch pads with Cascade Liquid Dish-washing detergent to clean the decks. After cleaning and drying we use SEMCO, Natural. It does not make the deck slippery and is easy to apply.
We do not use acid cleaners, sand paper, stiff brushes or internally put salt water on our decks. We have seen first hand and talk to deck guys who repair teak decks where salt water has gotten into the core, under the planks or in the seams. When it comes time to do repairs the salt residue left behind is a PIA. If your sub-deck is plywood or balsa core and has been immersed in salt water, short of removal it will never dry and will always attract moisture. I know, historically salt water has been said to be good for decks but not on Hobo. Our decks are in good shape but 100%, sometimes I would like to think so.