This was mine last time I cleaned them, a few weeks ago. I used the anti rust stuff and greased the threads before installing them and for the 3 years since then I've just wiped them down and recoated them with white lithium grease once a year. The springs are just surface rust, nothing to worry about. I used these daily and through a Scottish winter, so I'd say they are in a perfectly acceptable condition.
As mentioned coilovers socks would help keep all the crap from the road off the springs and threads, if you wanted to keep them perfect too.
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