That method worked great! The top and the sides are nearly perfect after the
first run! I used the "Cillit Bang Kitchen Degreaser" (the only one I found on
the store shelf) and, after spraying the surfaces, let it set for 10 minutes -
just like you said!
Though, I did try it first on a knob for a stereo receiver that had gone
sticky in the same way, just to know what to expect.
I'm waiting for the second run on the top of the box to do it's thing, but so
far there is no hint of the surface becoming lighter nor has the printing
faded!
- Unfortunately, the felt on the bottom of the box didn't appreciate the
treatment (even though I didn't spray the bottom). However, the bottom of a
box isn't really all that relevant in my case (pun almost intended).
However, I'm really glad that the contents of the box is of much higher
quality than the box itself! :)
Edit: As the felt wasn 't up to snuff, I decided to remove it. I found
new print!
My guess is
that IWC wanted to optimize their rubber material and just covered the back
piece with felt in order to "fix it".