How do you go about teach students that aren't kids to read music, do you use any books or worksheets or do you just explaing the lines and spaces?

Every Good Boy Deserves Fudge etc.... how do you do eet???

to be honest, I don't rely on FACE / EGBDF etc much with any age group.

If your student can be shown that the treble lines move away in thirds from middle C, and the bass lines do the same thing in the opposite direction, hopping up and down the lines can become a way to find notes. No letter names needed. Of course there will be times when note-names are needed - but this way gives them a good general picture and helps widen focus away from middle C.

Remind them also that the treble clef is a stylised letter G, and bass clef an F, and they have a couple more landmarks.

I only use the pneumonics in passing. I tend to get pupils to read music by reading the intervals. The treble cleff is a G clef and points to the G line, the Bass clef is an F clef and points to the F line the rest works like a ladder where you tread in the gaps as well as the lines. It works well enough and then does not confuse anyone when you add the Alto clef when you get to that level teaching theory. With little kids I write in note names as an aid memoir. I expect adults to know better.

The treble cleff is a G clef and points to the G line, the Bass clef is an F clef and points to the F line

glad to see you're adding weight to my argument !

Theoretically like the C clef they are also moveable. It seems pointless teaching people things that then are contradicted when they get to a more advanced level. Music theory and reading music is logical pneumonics can help but if you don't know how it works you cannot explain things in a variety of ways according to that students needs.

Hahahhah sweet, I'm going to write a piece with the trebble cleff in a different place just to be difficult :D:D:D

The only difference in my approach between adults and children is that with adults I tend to give a bit more in depth tour of the stave and how it works at the start because with adults (and teens) the tendency is to introduce up to 5 notes right at the beginning.