Pull it apart again, place the fan to the vacuum cleaner and suck out everything possible. Hold the blade of course, to make sure it's not spinning when you do this.)
An absolute bonus is if you have a pipe cleaner and dip it in isopropyl, you can bend it around and slot it under the blades to work it around the underside near the shaft.
Below: You need to be able to pull the fan case open to do this. After, if you have any olive oil (or Vaseline) lying around, let a drop go in where the fan shaft is, going into the armature ( also known as the electric magnet motor thingy) and give it a good spinning with your finger. Possibly use the vacuum again but this time let it spin. Try to get the excess oil out before placing it back into the machine.
P.S. Olive Oil isn't conductive, and there's no components around that area that'd get any contact with the oil in the first place.
I myself use Vaseline for my fans because it's a JELLY and it stays where I tell it to stay and doesn't argue with me. Remember, your fans are technically UPSIDE DOWN inside the case.
Thirdly, if you haven't noticed, your fan sinks aren't screwed down by anything, they actually sit FREELY and rely on the CPU / GPU's screws and their Fans respectively (total of 7 screws) to stay down in the case. Place something beneath and possibly above the heatsink like a bit of foam or anything that can withstand 60-70*C constant temperature to bridge the gap under / above the sink to stop vibration.
The foam on the heatsink trick of course is if you cannot fix the fan, this should minimise the noise.
Feel free to discuss my botchy solution if you FEEL it doesn't appeal to you / sound safe / ethical / voids warranty.
The most extreme, yet possible way is to take the fan and literally dunk it into water and give it a wash... filtered or distilled would be better. As long as you allow the fan to dry, and I mean.. really dry, give it a shake and possibly vacuum it (again) to make sure NO water is present and putting it in a ziplock bag with maybe half a cup of rice (to absorb all the moisture) it would then well.. be clean of anything that could have built up inside of it.
Only do this if you're certain your fan has no capacitors on the daughter-boards beneath the armature!Just remember you need to oil it again after washing it.
If you're thinking of using WD40 to clean it, I recommend NOT doing this, as WD40 remains and eventually dries out. Meaning, if you apply WD40 to clean it, and add oil after (or rely on WD40 alone) it will dry out and your fan will become worse.
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