In a bowl pour hot water from the engine up the middle and put it through the filters and the portafilter upright. Pour two tablespoons of scouring powder and let it act for 10-15 minutes. Then take them out and scrub with a sponge, no SOAP but only with water. The portafilter must be clean across the surface and especially in the hole that ends in royksoyni. There is also the point that sits the maca and when is unclean can be very bad for Brown.