For laptops whose fans spin normally but produce sharp noise, we on-site disassemble the fan module (not just blow from outside), remove lint and fibres accumulated around the blades, and carefully peel back the rear sticker to inject a small amount of precision lubricating oil (not grease) into the sleeve bearing. This can temporarily alleviate axle noise but does not repair worn blades. We provide before/after noise comparison (non-professional grade).
A deposit covers disassembly risk; final fee is based on fan removal difficulty (inverted motherboards require full disassembly) and the number of fans lubricated. European homes with carpets tend to attract fibres; we recommend periodic maintenance.