Ok deoxit is a contact cleaner and does the job but so does tim clean or isopropyl alcohol and it's a lot cheaper than Deoxit

as for No-oxid I have this and it's great for smearing blades for storage,it works on flashlight threads too but it's let down when it comes to using on MT's and SAK's because it's too thick

which brings me to the best all round lube for lights and SAK's MT's Nano-oil I've been using it for years and simply put IT WORKS!

remember tho even mineral oil works ok, everybody's MMV