Q. How do I clean plastic transplant containers?
I, too, reuse my plastic containers, but I do wash them carefully first with a good scrub brush and plain water. In some instances if I am starting seeds, I wash the container with a cleaner that contains Clorox so that the container is sterile, to some extent at least. I worry about dampening off diseases. Rinse the containers well so that none of the cleaning solution remains.