I would think it would kill the plants, but you gardeners would know more about that than me!
Amonia actually raises the level of nitrogen in the soil and because nitrogen is a catalyst for the reactions inside plants, they become bigger, grow faster, bloom more, and are generally healthy.
As for the main topic, I have found that for removing propolis from a hive tool it works to just heat is up inside a smoker for about five minutes(only heat one side). Get a heat mit, grab it by the unheated side and jab the heated side into sand repeatedly. I have found this to work quite well and, as for removing it from clothing...it usually comes out in the wash. (use Oxyclean)