How do you pass a mouth swab for THC with non detox?

Detox products are in no way proven to clear your system in lightning speeds, and they are rather gimmicky. In the end, they tend to speed up the process of detox, but don't really prevent you from failing a drug test if you have one the next day. I've heard stories of putting things in your mouth, washing it out and all sorts of things, but all I can see that doing is reading a false positive or doing absolutely nothing at all. In short: you're out of luck if your body is not clean before the swab test.