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How do you keep your regs O2 clean the second it leaves your AS9100 / ISO Certified Class 7 clean room where you use your ASTM G127 compliant cleaning agents and then you man handle the din portion with your hands that gets screwed into the valve of a tank that was sitting in some random compressor room while it was being filled being exposed to all kinds of particulates then getting some random whip screwed into it that who know when that thing was last cleaned to fill it.
Mate I think your taking this o2 cleaning to the extreme end of the spectrum if your trying to figure out how to o2 clean your tools. Yeah don't use some rusty tool you found in the bottom of your tool box that is covered in WD-40 but if you just use regular normal tools it will be fine. Don't worry you are not going to blow up.
Find me a case report of someone blowing up due to diving equipment not being o2 clean.
Basically my point is your regs and valve are not o2 clean the second they leave an o2 clean room. Unless your o2 cleaning your valve and reg after every use and assembling it in a clean room, pressurizing it then taking it for your dive. Think about it the DIN O-ring and mating surface are the largest high pressure surface areas in the whole system and they are constantly exposed to foreign elements especially the valve.