RE: Storage clean or regular clean
If you want your ML looking and functioning well a year or more from now...
Detail clean and lube after every firing at the end of the day. Even if only one shot. Even if you are going out again the next morning.
I've worked on too many ML's over the years that were only fired once and that were meant to be cleaned, but then never were and now are a rust bucket.
My .02
Tahquamenon