Rowenta Steam Iron stopped steaming?

[buckaroo]

We have a Rowenta DG940 Steam Iron but its suddenly stopped steaming?

I didn't know whether there was a simple fix for this before we bought a new one?
Looks like its a common problem, whether this model or others in the same range?

 

[foxhole]

Usually just limescale build up. I clean ours with descaler.

 

[buckaroo]

Thank you, yes I did think this.
Is there any particular way you take yours apart and which parts to clean specifically on this model?

Thanks