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Since the tool won't see high pressure o2, it just needs to not have contaminants on it.
Scrub them with some dishwashing detergent in hot water to get any oils off, make sure you rinse well, then maybe something like acetone would work. If you just have a couple tools, it's probably worth having specific ones for O2 use.
I have dedicated tools for reg service and treat all regs as possibly being used for O2 service. Simplifies the process and maintains consistency. You only need to clean the tools well once when you get them. Keep them dry and separated from other tools. Wipe down with microfiber or other cloth that will not leave fibers on them. If you feel you need to, keep them in a ziplock bag. I don't. They just stay in a drawer on my service bench. Unless you are dipping your tools in motor oil, you don't need to O2 clean them. Just keep them wiped down and dry so they don't rust.