I just bought my first stainless steel mash tun. It's a 15 gallon pot with a stainless false bottom, 3 piece valve and thermometer. My question is what is the best way to clean it before it's firat use? should I soak the individual pieces with a PBW /hot water mixture and then assemble the mash tun and repeat again? On the PBW instructions it recommends cycling the cleaner for 20 minutes but I do not have a pump to do so.