When it was me with the pomace sometime Colorful, I have my old brewing unit with a new one replaced. The mere taste of the first coffees, was for me as if I had a new machine. The residue also landed back where they should be and not dirty me inside of the machine.
The brew group came neatly packaged, greased and was changed in a very short time. An investment that one or the other should make for a couple of years.