it'll build up a protective surface over time , soak into joints and seal moisture out .....i don't mean spray your whole floor with it , just a bit here and there and push it around.......
look mate , if you don't want advice from people who have nearly 40 years in the building industry then don't ****ing arsk.....ok ....:rolleyes::bigwave:
don't wash it , there is a firm called Enjo who have a range of dry mops for timber floors , sweeping regularly and maybe a dry mop with a bit of MR SHEEN or similar once a fortnight will do , definitely don't "wash " it.
are the butt joints glued...?