This fan is dusty and very noisy. Time for a cleaning!
Step 1: The Tool.
A half inch wide paint brush is just the tool needed here.
Step 2: Cleaning.
Gently brushing the accumulated dirt off all surfaces is all that is needed.
Step 3: Completion.
See how clean it looks now? Took less than 2 minutes to do this. When I powered up the fan it ran so quiet!