Clean patio stones with a solution of 1/2 white vinegar and 1/2 water in a spray bottle. Leave for 10 minutes and rinse off (soiled areas may require a little scrubbing). Also helps get rid of weeds too! - See more at: http://www.glamumous.co.uk/2013/03/101-household-tips-for-every-room-in.html#sthash.61AxeCrC.dpuf