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@rodabod
Get yourself some tartaric acid crystals from eBay or from a local shop. If it's quite scaled, then give it a nice and strong solution, and you can repeatedly re-use the solution, while avoiding putting any clumps of chalk back into the water tank. Let the solution sit in the boiler tank for maybe twenty minutes at a time. Pop out the shower screen and the block which is attached underneath and leave these sitting in solution too.