Be careful with the bleach on teak decks as it will eat the caulking up pretty fast. Personally I would give it a miss.
I use "Patio Magic" £12/5litres free delivery from Amazon, dilute 4:1 for bad mould, 9:1 if mild mould. Brush on dry decks, 2 coats, let dry, a fewdays later mould gone deck is grey when dry and pale brown when wet. Works on sprayhood/canvas as well.