And of course, you should make sure whatever you are cleaning is powered down. For PSUs, it's probably better to just clean them with air from the outside. And generally a power supply should not be opened unless you know what you are doing, as capacitors inside can potentially contain a dangerous charge even after being powered down for some time (though I think that's more a problem for some cheap and/or defective units, as most modern PSUs should drain those fairly quickly once unplugged). RAM contacts are typically not going to require cleaning.
Using a soft brush is probably a safer option for just removing dust though. Usually alcohol is just used for things like cleaning thermal compound off of CPU heat spreaders though, and dousing things in it can potentially carry some risk of damage.Ĭompressed air can be used to clean dust off of components, though you want to make sure the can is held upright and not tilted too much to avoid spraying liquid onto things. Isopropyl alcohol (ideally in the 90%+ range) evaporates quickly and typically shouldn't cause damage, and a motherboard could technically be submersed in a vat of it in the event of something being spilled on it, but you want to make sure things are completely dry and moisture isn't trapped under components on the board before running power through them. Isopropyl alcohol can be used for cleaning components, but for something like a motherboard it's probably best reserved to be used as a last resort, if something is too dirty to be cleaned by other methods.
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