User blog comment:Bennlimos/HxH Questions & Thoughts Discussion 2/@comment-25589193-20141027213703

Most of the questions are already answered, so I will leave just a note:

In the manga it is said that Shizuku refuses to make Blinky inhale anything she (Shizuku) considers is alive, so it isn't the vaccum cleaner can't, but Shizuku chooses to not. So probably she just doesn't consider the cells alive, and once she considers they're alive it would probably stop working (or a bigger consequence if it's a restriction to make her nen stronger)