Hmm...I never thought of it that way, maintenance items. I did like the others and used tickler files. However, dentists appointments perhaps you can do that with because they occur every so often, but I like the idea of "keep car clean." I find myself thinking about and spending some time every now and then about when I am going to wash my car, sometimes about when I am going to clean my room, etc.
Having a maintenance file like that might help, maybe one for house, one for car, one for body (which would include hair, face, etc).
We need more clarification on this, I want to know if anybody else is doing it this way.