Bleach such as Clorox—10% solution (1 cup of bleach in 9 cups of water)
Sodium Hydroxide (lye) – 1% solution (1 pound can in 99 pounds of water [~12 gallons]
TSP (trisodium phosphate)– saturated solution—add solid to (warm) water with stirring until no more will dissolve and then a little bit more so there is always undissolved solid on the bottom of the container. It requires approximately 1½ pounds of TSP per gallon of water.
Remember to wear eye protection, gloves and water repellent apron when preparing and using these materials.
Soak cutting tools for 3 minutes before using again. Even better give them a brushing in the solution at the start of the “soak” Give workspaces 20 minutes of soak time.
A propane torch is good for sterilizing cutting tools. Heat the blade to just before it turns red. I know that this is hard on secateurs, so buy cheap ones and throw them away when they become unusable
Single edge razor blades are great when their use is feasible. Use once, drop them in a can and then sterilize in an oven—2 hours @ 400 degrees F.
I am not sure unglazed pottery pots can ever be properly sanitized in a solution, but I would surely give them 24 hour soak rather than 20 minutes. A better method might be to heat them in your oven at 400 F for 3 hours.