My routine for my espresso machine is similar to yours, but a bit less intensive. I also water back-flush after every session, but only once or twice. I only back-flush with Cafiza once a month. My routine at that time is about the same as yours. As for the grinder, I started cleaning it too monthly, but gave it up entirely. The Sette, well mine at least, seems to retain nearly nothing. What it does retain comes out first thing in the day with a 5-second purge. If making milk based drinks I don't even bother with that if the machine was used the afternoon before. Yesterday, as it so happens, I did take the grinder totally apart (guilty conscience
I guess. There was nearly no sticky build-up, very little chaff inside the body and next to no powder in places where it shouldn't be. I probably removed less than 2-grams in total and did not have to use any chem...just a brush and a rag. Some years ago, I moved away from the traditional Italian and French roasts for my espresso. I hypothesize that roasting to FC+ results in less crud being retained in the grinder, especially oil and sticky dust that I used to find in my older grinders.