Clean an oscillating fan without opening it - GIF

Clean an oscillating fan without opening it.

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Previously:

Belt-driven ceiling fans - photo
Fabricating electric fan grilles - GIF
Fan propelled pallet truck - GIF
Jacket with cooling fans - GIF
Overhead fan for gum-chewing stenographers - GIF

Great, lets spray water and a mild acid into an electric motor, what could possibly go wrong?!

What do those glasses mean? I see them around the net.

The glasses mean "I'm a tiktok star"...