I have been removing all of the zolatone from the panels. Boy, this is quite the undertaking. Nearly all of them are clean (minus end caps), but there is one section that has a zolatone like residue that refuses to come off! I've attached a photo.
I've been using citristrip, which has worked just fine, and cleaning with "safer mineral spirits", but the back corner section is having a hard time coming off.
Has anyone else had this challenge? Is there a different product I should use?