I use Shooter's Choice and it seems to clean my rifle bore well. I pour it from the large commercial bottle into a smaller squeeze bottle - I think its polyethylene or something like that - that keep in my cleaning kit and take to the range. However, after some weeks in the squeeze bottle, the cleaning fluid becomes thicker and viscous. I think it is reacting with the squeeze bottle somehow. Is there another more reaction resistant squeeze bottle that you all might be using that will not cause this problem. Havn't found one in my search of the usual online retailers.