some contemporary ink-jet printers do a periodic automatic clean of the heads, if not used frequently
- this may happen when the printer is not powered up
- it is better to leave standby power permantly ON for this reason
Rpeters08:02, 31 August 2012 (EST)
But for those not wishing to replace their printer, do a Google for "Cleaning inkjet printers". I found many things there which would have helped me 3 years ago such as the need to soak heads in a solvent such as isopropyl alcohol (available from Dick Smith at $7.99 for a 250 ml bottle for of ISO PRO Cleaner Pump Spray), for possibly about 4 days www.weeno.com. A more powerful solvent "Print Head Clog Buster" from inkmizer is described by , again requiring soaking for possibly several days. Also less drastic alternatives are suggested such as Windex glass cleaner and a 50% ammonia solution.
For those interested in more detail I am particularly impressed by 
Jeff - 18/Jul/12 --