Bleach dissipates naturally and is nearly harmless after having done so. There is no lingering residue or ill effects after using bleach for cleaning items. I have had saltwater fish for over 30 years and every time I set up a new tank I wash it thoroughly with bleach and let it dissipate before rinsing. Marijuana is a LOT stronger than saltwater fish, so if they can thrive in a tank that has had several gallons of bleach in it, I'm sure plants will do the same. Just let it sit for a good hour or two after washing and rinse well, there is nothing bad about using bleach as a cleaning agent, as long as you rinse it well afterwards.