My wife liked those big, chunky candles. When the wax got too low and the wick failed, I would add a chip of balsa, which would act like a floating wick. It worked great and so I would save all the candle scraps for this method. One day, the wax got a bit low in the dish and the whole lot burst into flames. It seemed to take forever to get to the kitchen, soak a towel and return to the inferno. Maybe I should have tried spitting on it like you did.
I should have left the ceiling stained, trying to wash it just made it worse and I had to redecorate the whole room. That'll learn me.
Dave