On Friday, November 18, 2016 at 5:15:14 PM UTC-8, Oren wrote:
On Sat, 19 Nov 2016 00:05:58 -0000 (UTC), Robert Bannon
wrote:

I've found, through decades of experience, that gasoline, which also fails
sometimes, works more often than any other household common chemical.

Lighter fluid, NAPHTHA!

Did you try peanut butter on the labels?

I use common cigarette lighter fluid available everywhere in the tobacco section.