I've been told bleach is inactivated in the presence of dirt. In other words that you have to clean with soap etc., first and then treat with a 10% bleach solution.
I used to soak my plastic pots etc,( I hybridize plants) in it over a couple days but, it doesn't seem to curb a soil mealy bug problem. Maybe you do need to use soap & water first.
When I had the kennel I used to fill a plastic watering can with straight bleach and drizzle over each dog run a couple times a year and after wormings. The dogs would be locked in for an hour or so , until I watered it in to the pea gravel thoroughly. I can tell you the fumes could knock you out in minutes if the ventilation isn't great.
So I really would like to know the prevailing knowledge on this - is it necessary to remove dirt before disinfecting with bleach solution. Or can you just add soap to the bleach mix?
Thanks for any answers on this.