I am going to try the vacumn tonight on my BA center channel. One of my sons pushed in the passive radiator which was and easy fix, but when the other sone pushed in the woofer I couldn't figure how to pull it back out. We will see if it works. The dust plug isn't overly stiff.
I learned my lesson to keep the speaker grills on the speakers around small children.

I normally do, but I was refoaming the speakers at the time.