While i was washing and drying various consumer electronics boards scavenged today for parts transplatation to my bin tomorrow i had an idea... My projects always mostly use a fan but i always bought a new one since they are cheap.
But why not recycle them? There is no life for them on the dumpster.
So first take these dirty fans and put them in your bathtub. Give them a nice hot shower and wash them with dish washer detergent.Warning - remeber to lock the door of bathroom so your wife does not see that you are putting dirty fans in bathtub she cleaned few minuttes ago
After few washings and they are clean dry them with compressed air.
First patient draw more than 1 A, spins very slow...
Take your Atten 858 soldering iron and heat the label to remove it carefully. You will need it later. Remove the rubber seal, then use tweezers to remove white lock and a small rubber seal again. At this moment the fan will fall apart and you will see why it does not work. Clean all parts, apply ball bearing grease (not regular one, but the one designed for small bearings) to axle and top and bottom of fan. Reassemble and test
Patient lives, works nicely and even the input current is lower than specs. After about 10 minute "burn-in" the current fell off to about 190 mA (as the grease spreaded where needed) and fan is absolutely silent and working perfectly.
Maybe a time consuming work but surely recycling is better