I was prepping the XKR for a trip to Montreal for this coming weekend, as I was cleaning up the engine bay and waxing the inside of the hood (outside the liner) I noticed the liner was fading, heat, dirt etc is taking it's toll. The liner itself is in very good condition but I'd like to 'darken' it back to black. I'm open to ideas on how to achieve this, I'd prefer to not remove it for the process as once off never on like new. Thanks