For making cleaning and disinfecting solution of 0.1 % bleach, to make this take ¼ cup of bleach and mix it with 4 liters of water, mix well and keep it for cleaning kitchen slab, tiles, stone surfaces, sinks  ( avoid phones, hands, electronic items or painted surfaces as bleach is very harsh ) use it within 24 hours. Avoid using unwashed crockery and particularly plastic as corona stays on plastics longer.