I removed all the keycaps and then cleaned it with some dry cotton swabs and a handheld vacuum cleaner.

The Control, both Shift, Delete, Return, Alt, and both ◆ (Meta) keys were easier to remove than I expected. For the spacebar, I simply removed it manually without any tools after removing the other 59 keys and then set the spring aside.

Eventually, I intend to clean the keycaps with soap and water. There is an official cleaning guide, but this was just an informal cleaning to remove the dirt I found.

Almost unrelated: TIL typing a space in top(1) updates the screen…