So apparently the design decision to use rubber coated nobs by Arturia was a Booboo.
The rubber just melts and starts to gather hair and gunk.
So I just spent a whole afternoon pulling off the nobs and cleaning them w 91%alcohol.
They are all nice and clean now shiny and beautiful again.
Make sure you are outside to do this.
Just pull all of the nobs off and rub them with a wash rag.
I used alcohol but dish soap might work too.
You have to clean the slider nobs also.
I consider this just basic maintenance.
Ill have to do this to my microbrute also but they are not sticky yet.
BE CAREFUL putting the nobs back on.
I put one on wrong and then it was loose forever, I just put a drop of elmers in the nob and it held.
Have fun, make sure you use alcohol OUTSIDE!