What is the best/way to really get those flashlight threads cleaned? What do you guys use & how to do it without thread damage? I mean like thick gunk in the threads. Thanks!
Stiff toothbrush ... toothpick ... or a small brush with brass fibers ... is what I use.
(Don't over-clean the thread areas that are anodized , you will remove the electrical insulation qualities and no longer have unscrewed tailcap lock-out ability)
.
(Don't know why I'm helping you ? - You're the source of my allergies ... ragweed !)
I use alcohol wipes and lint free paper towels. The alcohol isn't very agressive but does a decent job of removing old gunk. I then use the lint free towel to finish and the threads get nice and shiny before applying your favorite lube.