I once owned a very sneaky tomcat. He made one of my
PCB's a place to
leave his calling card--and I didn't discover it for about a year.
By the time I got to it, the urine had corroded the copper right off
the substrate in places.
I threw it out. I don't own cats anymore.
Cat Pee is something VERY corrosive. But a nice curiosity - it reacts to
UV! If you use a UV lantern and take a look at your collection (on the dark,
of course!) you'll see where the d at mm bastard peed.
Love cats, but hate their pee.