Interesting subject - I believe this has come up in the past - what is your janome model?
http://www.quiltingboard.com/main-f1...a-t167737.html
http://www.quiltingboard.com/main-f1...e-t172085.html
http://www.quiltingboard.com/main-f1...ed-t45573.html
as for cleaning i found youtube helpful.....
https://www.youtube.com/watch?v=CouZ9dO_y0U
but I point out machines differ in some things from others.....
you might be interested in facebook group dedicated to janomes.....