Hi Mike.
Interested in your post. We have a 2005 IS200 in very good condition that we have owned since new - looks just like yours. But we also have the sticky dash problem and it is getting worse. I am assuming that you paid to have the new dash and centre console fitted, or did Lexus come to the party in any way? I am intending to pay a visit to my Lexus dealer in Melbourne later this week to see what they have to say so any feedback regarding your experiences would be great.
Thanks, Janet