Never heard of that, but dust rides into the computer on air, so even if it doesn't stick to your fan blades, it will stick to anything it can inside your computer.
You are better off using good old fashioned filters.
Anything inside the computer can be easily cleaned. But cleaning case fans is a hassle. If the computer case is somewhat cramped, removing case fans to clean them means I have to rewire everything again.
Anything inside the computer can be easily cleaned. But cleaning case fans is a hassle. If the computer case is somewhat cramped, removing case fans to clean them means I have to rewire everything again.
If you use filters, neither the fans nor the inside of the case need cleaning. (Maybe the inside needs some compressed air once a year if it's dusty where your computer is)
If I use filters, the filters have to be cleaned. It's easy to do that, if you have those cases with easily removable filters. But my case is NZXT 210 Elite. Removing filters take as much effort as removing fans.