No chemicals - No scrubbing
Use a sponge, and some Comet cleanser. No chemicals whatsoever, no hard scrubbing in any direction. First, thoroughly soak the teak with water, and wash with boat soap. Rinse very thoroughly. Then, sprinkle Comet on a section of teak, and a little on the sponge. Wash the teak with the grain (as much as possible) using just the sponge. Rinse, and rinse again - until the rinse water is clean / clear.
No scrubbing - with, or across the grain of the teak. Keep the sponge clean.
Repeat this procedure the next day if you can (or as soon as you can). The grey will eventually lift, and the rinse water will run clear. The teak will turn from grey, to grey-brown, and eventually to brown-grey.
Does anyone have a recommendation on how to clean the teak decks. The decks have not been cleaned in many years and in great need of a good cleaning. I've heard recommendations from pressure washers on low power to bleach diluted with water, pine sole, etc. I don't want to mess it up...I'm sure there is a beautiful deck underneath the years of dirt.
thank you in advance for your suggestions