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@deleted
Coffee machines on the other hand are constructed of a range of materials, including plastic, silicone (in seals), aluminium alloys, brass and stainless steel, complicating selection of a suitable descaler
http://en.wikipedia.org/wiki/Descaling_agent
http://www.misc.philips.com/senseo-descaling/us/en/descalingHD7805HD7826HD7840HD7841.html