A. If it is entirely & properly sealed, yes. It’s best that the microwave interior be visually clean as well. Providing, of course, that the product itself is Kosher for Passover. Holiday-wise electronic microwaves would only be OK on the intermediate days of the holiday, but we wouldn’t use them on the first 2 or last 2 days of Passover which are holiday-days. BTW: double-wrapping is supposed to be a temporary (but legit) arrangement, but it shouldn’t become a primary mode of keeping Kosher.