Hi folks I'm looking a bit if advice on how to make sure that a standard gas bottle is empty before I take my grinder to it. I watched the videos on YouTube take of the nut bit and fill with water till overflowing then leave for a day or two and your good to go. Now I've heard some story's of this being done but some gas remained in the bottle and went pop when a grinder was taking to it. What's your hands on experience in this to those of you that have done it thanks in advance for any help it's greatly appreciated