The usual way is to put the solution into the tank at the required strentgh (usually on the packet/bottle) and run it through the machine as if you were making espresso. Once all the solution has gone through run three more tanks of fresh water through to clean it out.
If the water has stopped coming through then it will almost certainly be scale. The Evoultion has a recessed brewhead and it can be prone to scale. The only way to fix it is to remove the brewhead. Not that difficult though. You first need to remove the portafilter (bit coffee goes in). You can then see the brewhead. It will have a hole in the middle and two holes either side. The two holes are hex head screws. If you remove the screws the head will come off. You might find though that the head will be stuck on and will need help to come off. I have had to use a make shift puller before made from a few bolts. Once off the scale will be found on the reverse of the bit you can see. Clean it all off and then put it back together.
Hope that helps.
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thanks for that. just started running the water through the steamer and now that has stopped working! maybe problem is more than decalcifing...
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