I have a couple FO's that smells really good but I get a fuel smell when burning in a candle. I've heard to add a little vanilla to solve this but I'm not sure where to start on amounts. Was hoping someone could help me out. Can you just add a few drops of vanilla or actually mix as a percent of the original, like say 90% with 10% vanilla added? I know most people will say try it and see, I was just hoping for a tip, At least where to start. Thanks Rebecca