Thread: CRC or WD40 for maintenance?

Both WD40 and CRC are good for cleaning. And they do leave some film behind after evaporating so better than nothing. To leave a more reliable protective oil film I wipe over with a rag lightly soaked in 4-in-1 oil.

Gun bluing does not protect much against rust unless it is oiled (bluing retains the oil in its "pores" and together they protect).

Carbon and/or copper fouling - I clean first with washing up detergent mix on pull-through rags. Then I wipe the muzzle and seal it up with electricians tape and point the rifle down. I pour a freshly mixed amount of citric acid + hydrogen peroxide into the barrel, leave 15mins (or until bubbling stops!), rinse well with water and then pull through wads/brush until they come out clean. Finally a rag with some 4-in-1. Not saying it's only or the best method but it does work. Be careful getting this solution onto unprotected (non-oiled) bluing.