I don't think you want to add bleach to your watering if I'm reading your response correctly. You want to put the bleach in a spray bottle and shield your plant and spray the soil surface. You can also skim the soil surface away1/2 inch down, treat the next layer down and then replace it with a fresher top layer and make sure you let your soil dry out andh avea fan going at all times to circulate the air around your plant.