I am starting to work on the bed of my 56 Chevy. The sides and head board have tubes running the length. I can clean them a little, like I do my riffle, but I can not really do a good job. I have one of your wand guns and can reach almost half way in from each end. So the question is which one of your products would you recommend I spray into the tube? Which one would work best in the crease? Thanks for the info.