If green algae has built up in your steam generator iron’s tank, you can try the following:
1) Fill the water tank half way with hot water and shake it carefully.
2) Empty it and rinse well with fresh water (do not use detergent).
Please do not worry if the algae remains: it will not affect the quality of the steam produced by the iron.
Note that emptying the water tank after each use will help prevent further algae build up.