Re-using pots - how do you sterilize?

[Fairorchids]

I know that most use bleach to sterilize old clay pots. However, I wonder how effective that treatment is?

I have seen one grower stack old pots in a large plastic tub, add a gallon of bleach, and then fill up with water.
That tub probably holds about 20 gallons. Assuming a regular bleach (6%), that means:

• we are down to 0.3% concentration.
• provided that the bleach was fresh, and not deteriorated sitting in the bottle.

Even though he lets the pots soak for 2 weeks (with bleach evaporating/breaking down), I am wondering whether this is adequate to kill any virus particles in the pots?

My personal preference, is to scrub the pots, so they are clean of any plant material, and then bake in the oven at 425F (abt. 210C) for 2 hours.

Does anyone have solid scientific data on concentration & soak time required?