LIVOS Glouros is the recommended cleaner for cleaning old greyed and stained decks prior to oiling with LIVOS Alis Decking Oil or other decking products. 

Suitable: for cleaning decks and some stone surfaces such as tiles, tombstones, walls and facades. Not suitable for marble, terrazzo or other calcareous stones sensitive to acid. 
Removes moss, algae, fungi stains, salt deposits and cement residue on decks and stone pathways. Partially dissolves some oils and proteins.  
Appearance: clear liquid concentrate

Odour: mild
Directions: Dilute 1:10 with water for cleaning. Spray or sponge onto the surface. Scrub with a non-abrasive pad. Rinse well with water and allow to dry thoroughly before coating. 
Coats: initial cleaning usually one coat. Can also be used as a leave on after treatment to deter further mould & algae.
Technical Data: Technical Data Sheet and SDS