This stuff is the best. I keep one on the boat, in the dingy, in the truck, in the garage, in the shed, and in the basement. My wife gets a couple bottles for my father and I each year for Christmas. Use on electronic contacts, trailer parts, squeaks that keep you up at night, Polish SS with it, uber-penetrant everything.
$15 a bottle, the aerosol version runs out of aerosol before it runs out of liquid (avoid), Dust and dirt do get caught in it. Little goes a long way and I'm always putting on way to much.
I get mine at HamiltonMarine.com
~Sunk, Salvaged, Refitted, Sailing!