How to Kill Weeds With Bleach. Weeds can be an unsightly addition to your garden. Fortunately, a bottle of bleach can resolve the problem of weeds in only a few days. Save yourself the cost of purchasing an expensive herbicide by reaching into your laundry supply cabinet.
Buy full-concentrate bleach.
Find a clean, empty spray bottle.
Pour undiluted bleach into the spray bottle. Use a plastic funnel to avoid getting bleach onto your hands and causing irritation.
Screw the top of the bottle closed and set the nozzle to "mist" or its equivalent.
Locate weeds on your property.
Mist the weed growth.
Switch the bottle's nozzle to "spray" or its equivalent. Spray the weed's root and the crevices from which they grow. Take care to not spray neighboring grass or desirable plants.
Wait 2 or 3 days while the bleach works to kill the weed's roots.
Return to the weed site and pull the weeds from the soil. The bleach should make their removal easy.