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Today my ps4 just got louder and sometimes its fps drops so i decided to clean my ps4 but i was afraid to teardown each parts. So what i do is that i only rub the vents and its metal (when you flip the cover off) with 70% ethyl alchohol but i dont submerged it too much , my question is , does the metal on my ps4 will get some rust?
It’s fine. You can usually buy 91% in any store that sells 70% and that would be better (99% is available online as well) and less water is always better. That said, “rust" is not the issue as it will evaporate fairly quickly; don’t power on the device until all of the alcohol has evaporated as you don’t want any liquid getting sucked into the device.