You only need to do this if you intend to clean the housing with soap/water. Years of use will have the inside of your Ionic Breeze absolutely filthy, which of course is it's intended purpose. Cleaning it won't hurt the housing. I simply scrub by hand with some dish soap to remove the filth. You may want to wear gloves depending on how dirty it is.

Wrap both ends of the power cable real tight with plastic wrap and wrap the entire thing in electrical tape.

My photo only depicts wrapping the top and bottom but I suggest wrapping the whole things in electrical tape if you have enough to spare. Better safe than sorry.