How many time do you have found your inkjet printer dead after a standing idle long period? Because of the low durability of inkjet prints I usually send them to a web print-shop, so my colours, althought I try to remember to keep them making exercise, often get dry. This happens more certainly if you go on printing after the warning of ended ink (whoops...).
Anyway... it's not a big problem if you know hot to solve the matter.
Step 1: Remove the cartridges
Some cheap printers have the head attached to the ink-cartridge, but those cartridges are much more expensive and the quality is worse. My Canon IP4600 is a not very expensive printer, but with a good quality and CD printing too, I love it. It has 5 cartridge which you can extract without moving the head, I've already removed them in the picture.
Step 2: Remove the head
To remove the printer head you have to pull up the gray lever. The head will come out with no resistance. Pay attention to not touch the rear contacts and the bottom side where you find the ink nozzles. These last are very delicate, don't scratch them with rags or other, also if you see they're covered of ink, anyway it might not dip..
Step 3: Find a proper suction tube
Now you need some luck, but also a good equipped maker shop will be useful. I've searched among the rubber tubes I had, to find one which has the right diameter for the cartridge joints on the printer head. These tubes are not essentials, because probably it's enough dip the head (the printer one, not your!) in water. But I think they'll guarantee the success.