I thought you'd want to drop them to a 6-6.7 ph before trying to germinate. I'm trying to reuse mine with 30 bhut plants, but so far, none have popped on week 2. I probably should have used the heat mat earlier. I did not wash or sterilize them either. My soil plants have all germinated (telecherry, jalepeno, short thai, long thai (dont know the actual thai names))
I dont like them that much. They are good for cloning and using in a hydroponic system like rockwool, but they dont degrade and doesnt work in my compost pile.
If one was concerned, they could put them in boiling water for 30 seconds (perhaps even pour over) to kill off the nasties. Then soak them in a solution of distilled water and a light amount of nutrients to ensure that the ph is somewhere in the 6 neighborhood. You'd also want to sterilize the container they're in, but styrafoam and plastic dont do well in those temps.
I say to hell with it and see what seeds are strong enough to germinate in less favorable conditions to ensure you have the strongest plants.