Irradication of the enemy - total blitz

I have had to resort to placing the gardenia in a black plastic bag or sack so that I can spray away to try and kill off the little bugs or mites that are killing off my plant. I liked the idea of trying to do this using something natural and so have mixed up a solution of washing-up liquid, lemon juice and tea tree oil. So far the plant has now received three heavy sprays and has been left dripping wet. It has been a good idea to contain it in the plastic bag as all of the loose drippings have been caught in this. I now have to play the waiting game to see whether the minute creatures have finally been obliterated.