can anyone tell me the best way to keep my block paving driveway weed & moss free without staining or changing the colour of the blocks I have tried a couple of chemical treatments but they are not very good & weeds ect. grow back quite soon .

c wright, June 2008

Once you have cleaned the blocks ,re sand (kiln dried sand) and then seal using thompsons one coat, keeps up well for a year

Raj, August 2008