I don't know why a bird would want to "be cleaned out"... such a thing may even be fatal. Their purpose is to eat, poop and lay eggs (females anyway). Anyway, from your last post, it looks like you intend to go through with this either way; so here is my suggestion: isolate one bird and put some room temperature green tea in a waterer and have another waterer with water. Then observe the bird to see if it drinks the green tea. If it drinks the green tea once, and never returns to it, then you have your answer, it doesn't like it. If it drinks the green tea more than the water, then after an hour, take the green tea out so it can only have water. I wouldn't run this experiment for more than an hour. Keep the bird isolated for several days to observe the quail. If after that time and the bird has no ill effects, return the bird to general population. If the quail dies, then you have your answer and I would not recommend any other "what if you feed your quail this" ideas.
As for me, I wouldn't conduct the experiment, but it seems like you plan on doing it anyway, I am only offering this "suggestion" as a way to not experiment on all of your birds and possibly have them all die. I alway stick to the thought process that if it isn't broken, don't fix it.