Can only comment on the Bilberry, it is decent, mine has last years. As you dilute it down, so worth considering that when comparing cost.
Out of the loop due to above so cannot comment on the other products. My thoughts are similar as others though, you may need something stronger to start, Interestingly the inside of the Focus wheels were like this sounds and when it was in at a detailing place, they mentioned the wheels had been refurbished before but only the face, inside had been left, I would never get them clean and needed a refurb.