Never 
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I should add we do this once a year in spring time when all furniture is moved clear for a deep vacuum & carpet shampoo clean. We call it the big spider & wood louse round up.
Strangely it appears that there’s not a lot of people thinking that’s important to clean the contacts. Probably because Naim doesn’t recommend it….
I think you need to carry out some thorough blind tests before some would believe your findings!
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I know you are joking, because the blind test would consist of cleaning the plugs, listen, then dirt the plugs again, and listen.
What a useful task! 
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I usually don’t do blind tests as they don’t interest me. It’s the same with amp comparisons. Frenchrooster does have a point though, blind tests on Fraim don’t work too. 
The improvements are marked, seriously.
I was kidding😃
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You can test Naim Fraim. If you have 10 boxes, you invite 10 friends. First you ask them to carry in the air each box, in the same time for the 10 persons. You listen. Then they all put back the boxes on the Fraim. Second listen.
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Careful or Richard will moderate this tgread for becoming a proxy discussion of blind testing! (This response tested blid agains no response.)
Being partially-sighted I have specific anxieties about many of the things deemed essential with Naim kit such as rebuilding Fraim or cleaning connections. Patient friend invited me round to their gaff to show me how they do the latter twice a year. Inevitably bent a pin on a DIN 
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We have some contractors working in house downstairs and the mains had to be shut down a few times. While the power was off, a good moment to give the fuse & rod (neutral) from my spur a good clean with some silver polish. Yikes… It was only about 2 years ago but apparently that was too long. Sounded like I’d upgraded something… 
‘Exercising connectors’ is part of routine maintenance in many industries, I do it when I change things about or when a do a thorough clean, perhaps once a year but I’m not going to schedule it in my calendar.
Can’t say that i have ever heard an improvement in sound as a result mind you, neither has my car gone faster or I suspect the MODs’ aeroplanes climbed faster following such planned preventative maintenance, the idea being that they don’t break down quite so often.
I clean my equipment once a year using Kontak cleaner. I don’t think it leaves any residue, just let it sit for a while and it feels dry. I clean the RCA, speaker post, and even the IEC inlet. If you include the power cables, HiFi racks, wipe the length of the speaker cable/interconnect with baby wipes, and putting everything back. It will be longer than cleaning the car inside/outside and waxing it.
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