Battery terminal corrosion prevention

What are y'all doin?

I've never really had a big issue with it, but my 2015 Renegade failed to start this morning.
Battery checked at 12.67v, which I perceived to be good.
Closer inspection revealed a pretty good amount of light blue corrosion on both terminal clamps.
These are thin brass, plated with something that makes them look like galvanized steel.

Battery is less than 10K miles old.
I swapped the new AGM battery I bought for my 73 into it after cleaning the clamps with a wire brush (difficult to clean due to design) and it started.
I have not tried the Renegade battery yet. It was on a diagnostic charger and only ran about a minute before it was deemed "good" and "fully charged".

I've never really been a big fan of those felt washers, but do they help?
I do have some spray "protectant" but I'm not real keen on overspray getting everywhere.

I don't relish the thought of checking and cleaning the terminals every 5K miles.
AFAIK, the last battery was OEM until it failed at about 75K miles. I never had to clean the terminals before.