Cleaning

Outside cleaning
Simply clean with a soft cloth dampened with water. Take care with the screen as it has an anti-glare coating on it.

Powerbook screens exteriors are plastic. I recommend only a lens cleaner that says safe for plastic on the label.

Keyboards
Put the fabric or blinds brush on your vacuum cleaner or dust buster. Vacuum thoroughly.
For spills in keyboards see (Keyboards chapter).

Inside Cleaning
To clean the inside of a compact Mac you will have to disassemble it (See the chapter for your type of Mac model).  Other Macs covers are removed with a few screws or by pressing tabs on the back of the computer and lifting the cover off. Once inside, clean the fan and the screen (if applicable) that goes over it.  check any vents to see that they are clear. 

Use a device to blow any dust off the circuit boards 
or,
carefully vacuum the circuit board with a specially made vacuum for the job 
or,
My favorite method: using a new, long hair 1 inch paint brush, lightly brush and blow the dust away from a circuit board. 

Cleaning a printer
Clean the outside and inside as described for  a computer.
Print head cleaning: (Imagewriter II)
Platen cleaning: ( Imagewriter II)