As you know if you use the Hexi Bonfires, they leave a huge big, black filthy burn. Here is a new trick for you (unless you already know it). That is before you put on the fire, coat the whole of the outside in Fairy Liquid, you only need a small amount. Then do what you have to do regards cooking. All you need to do is get a WetWipe or something and just wipe it off. Thats it it takes about 10seconds. Opposed to absolute ages without the fairy liquid. It has to be fairy or something of similar quality. Try it.