Meguiars Hyper-Dressing. When you first apply it, make sure it is on evenly. You won't believe how dry your dash is and how much is absorbed.
It make take up to 10 applications before your dash looks better than new -
but it is definitely worth the effort. Makes all the vinyl look much more expensive. You can dilute the product as much as you care to, but I
recommend about 60% dressing to 40% water.