clear (with exceptions)

For the last week or so, I am burning incredibly clean. For those of you who have no idea what I mean by that, I mean that after I shit, I go to wipe and there's not much residue left to be cleaned up. One or two wipes of instinctual caution, and then I can pull my pants back up and wash the hands. Burning clean.

I can't recall from whom I got this expression, it's a pretty curious one. I've rarely said it out loud (given the subject matter in part, I guess), and I've got a suspicion, as I often do, that I'm using this idiom in a way that's incorrect. Maybe it commonly means something else. Maybe I made it up based on something I misheard someone say. The expression itself makes me think of oil coming out of the ground and being introduced to that little flame. Anyway, you, now, reading this, have three possible options: propagate my expression, do some research and tell me if I'm correct, or ignore this all together.

May your poops burn as clear as mine have been (the last one wasn't super clean, it was more of a three or four wipe scenario... and by the way, this is getting at the larger issue of how I wipe, but let's save that for another time).