You can clean it but it also holds a tank of ink which can fill up. You can empty it as well if you're up for the task of removing it, emptying it, and giving it a deep clean you can theoretically get it back to almost new. You will usually get a "Service Maintenance" error on the screen when it's almost full. If not, you could just clean it.
You can also order a refurbished one from LPS computer. They will give you a discount/rebate if you buy one and send them your old dirty one. I've done it twice and changing it out is fairly easy.