Cat vertical scratching on only smooth surfaces - help
Hi everyone, I'm new on here so thanks in advance for your help.
I've had two half siamese/half feral black cat brothers for about a year. They are almost two. They are both indoor cats and have been their entire lives. They are active, get good play time with themselves and with me, and are generally awesome. My problem:
The smaller of the two, also the apparent runt of the litter (they were born and raised in a vet hospital until I adopter them) has for the past two months or so been doing a really weird thing.
He will go a smooth surface (mirror, some heavy doors, and now my new flat screen TV!) and start sort of super speedy vertical rubbing for as long as he can go until I stop him. I clip their nails, and he's not really extending to them fully to get in there, it's more just repetitive up and down, up and down, really fast. He is doing damage to the TV, so I need to stop him. But I don't know why he's doing it.
They have three cardboard scratching pads, which they also use. The bigger brother NEVER does this, just the smaller one. I've tried "Stay Away," water sprays, loud noise, all work temp. but he goes right back. Tin Foil and Bubble Wrap work, but now my house looks like I'm scared the government can hear my thoughts, and I can't watch TV through Tin Foil.
Sorry this is so long, but I can't seem to find anything on this in the forum, so I thought I'd be thorough. Again, he's not...scratching, he's speed-rubbing.
Thanks again for, hopefully, all your help.
P.S. He does it at night and at the crack of dawn as well, which is killing my sleep. Please help.