> エアコンを掃除するときは、安全上、必ずコンセントを抜いてから **に** してください

I know this sentence means that you should pull out plug first if you want to
clean air conditioner, but what does this に mean?
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2023-04-24T06:24:05.313
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2023-04-25T14:42:26.297
2023-04-25T14:42:26.297
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question
grammar particle-に
what does に in this sentence actually mean?