yeah Hi, i put all my parts apart from magnets and delicate's in the ultrasonic cleaner and batteries i will use something like 1200grit sandpaper or wire mesh on aswell as the mods +/- terminals and then you could wipe any dust away and wipe with rubbing alchohol but...
if you havent got the UC then a toothbrush or a small fine wire brush and some soap liquid with hot water on the threads, chances are you have paint or stubborn oil in the threads, and the ends of your tubes where ever they .... against each other.
if i was at a push and didnt have a fine wire brush i would use a soft metal dish scrubber or pad and go with the threads.
I can go a good couple or 3 months without cleaning the mods or batteries and i dont put any noalox or any other substance on anything

but thats just me and i find they hit hard for longer IMO
But dont sand or rub back any plated contacts eg silver plated copper