When I shoot at the range I try to mimick being out in the woods. I always shoot in groups of two. I figure that is all I will shoot in the woods while hunting so I should practise the same way. What I do is run a wet patch down the bore and then a dry patch or two. I use a commercial fluid, but when I run out I will use a mixture like the one Cayuqad uses. Then shoot two more. This seems to work for me.