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NO, big NO. Few years ago I tried it and it ate nicked plated EK blocks to oblivion, next day I had flocks of nickel flowing through the loop.

When was this?

 

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2016/17 somewhere. X299 / 1080Ti times.

Was that when all the EK stories of masses amount of blocks flaking away or was it before that?

 

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If you email Mayhems direct ask for Daniel, they may be able to or contact a local NZ company and ask them to contact Mayhems direct.

White Vinegar is good, but buy at least 90 to 95% pure white vinegar and you need about 10% to 20% to water mix ratio. Keep it in the rad for at least 6 to 8 hours and slosh it about every now and then (every 2 hours).

Bicarb is needed after this and use 1 to 2 Tablespoons to 1 Ltrs of pure water. Leave it in an Uncapped radiator for 2 to 4 hours and slosh around every hour (just keep your finger over openings). DO NOT CAP THE RADIATOR WHILE USING BICARB. It creates gases that will expand when using bicarb.
When completed flush the rad with pure water 3 to 4 times to get everything out and you are ready to go.

I did this in a video a long time ago but now removed it from youtube and have no interest unless paid in reproducing such videos (to me the hobby has lost its appeal now)..

The maintenance aspect or some other reason?