Block Blitz Go Weed | Fast Acting Weed Solution | 5 LitreBlock Blitz Go Weed Fast Acting Weed Solution 5Litre Block Blitz Go Weed is a fast acting, weed and moss killer that breaks down and kills weeds and moss. It can be used to control moss growth and weeds in a wide variety of situations, such as paths, patios, gravel, unplanted areas of the garden, around buildings and in similar situations where moss control is required