This is what I know:\r\n\r\nIt is very important to clean the porta-filter, basket, and screen heads hourly by quickly scrubbing with a small piece of a green Brillo pad. A couple times each day and at night these components should be cleaned using tri-sodium phosphate (TSP) or a safer alternative such as Puro Caff. Scrub thoroughly, but quickly to avoid cooling the group head or the porta-filter too much, and rinse thoroughly. While scrubbing the porta-filter, back flush the group head for 30 seconds with the blind basket in place and a teaspoon of TSP. Follow with at least 5 rinsing cycles. If you have never cleaned your porta-filter before, place it upside down in a milk pitcher, fill the pitcher with water covering only the metal, add a couple teaspoons of TSP, and boil the water using the steam wand. Scrub periodically. This should get out the worst rancid coffee oils. If all else fails order a new porta-filter.
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