Hi all just after a bit of advice on what products are the best for a soft wash weed treatment for driveways I know sodium hypochlorite kills weeds but within a couple of weeks they start to return in abundance I understand the best way to control.is to seal the block paving but most of my customers are put off by the price of the sealants I personally think they are overpriced as well but hey ho ! Any advice would be much appreciated thank you