Silver Bullet for clogged printheads

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I managed to get it to run now. I have a major p[problem with this SX600FW as I cant see much about them and certainly not how to remove the cartridge cover without breaking it and also how to remove the printheads as its REALLY blocked badly now.

Can I request a bit more context so that we can understand the scenario, and likely causes a little better:

1. When did the printer last print properly?
   
2. Was there anything changed recently such as cartridge(s), ink/cartridge brand?
3. Anything else you can think of that would be useful info'?

As for potential fixes... There's a slew of things you could try but context is everything so I wouldn't waste a ton of ink and/or time, trying to force through a fix using the printhead cleaning function on the printer. The more info you can provide the more likely we can provide focused potential fixes.

Will keep an eye out for any info..