I had the problem with my Siemens EQ7 that the milk nozzle has not provided their work despite repeated properly cleaned as they should. It was only "sprayed milk" and the machine looked like hell.
Furthermore, the brewing unit creaked when coffee brewing - but without sacrificing quality - but sounded just not healthy to.
In one of the reviews of the notice came on the "Schnatterventil" (milk froth) - which should be greased - in a further indication of the grease the seals and valves of the brewing unit.
've Already committed almost the Customer on an appointment - until I ordered as a last alternative, the silicone grease.
And what can I say - so what madness has a small tube for a great effect. After lubricating the valves and seals the machine funzt like the first day. Milk froth as it should be and very quiet coffee brewing as the first day.
Thanks again to the helpful tips from other users.
Absolute buy recommendation.