Before my first AW (S4 SB SS ML), I never thought much about cleaning a watch/band. I am still clueless about how often to clean both the watch and ML band.
I exercise 3-5 times a weak on the stationary bike, but out a low resistance and rarely sweat. I sweat a lot in the summer b/c of the NYC heat and humidity.
My dermatologist suggested that a monthly cleaning might be reasonable.
I really like the redesign of the 2018 Milanese Loop. The fact that the band can pass through the loop lug, without having to always completely remove the band, should make it easier to clean.
I have been wearing the ML band that cane with the watch, daily without issues.
When I take the watch off, before bed, I find a slight indentation in the shape of the band, but I think all bands will do this to an extent.
Very pleased so far.