Different brands of frozen veggies use different cleaning processes. Some rely more on samples than others, some reply more on washing than others. Some rely more on the greenhouse process itself than others. There is actually a wide machlokes between the OU and the Star-K on this. Positive Produce is the cleanest, but they achieve it using chumras that my rav views as Bal Tashchis.As always, ask your LOR.
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