Dirty grime, minor tarnish, rust, etc. USE: Nevr-Dull, Mineral Spirits
For non-anondized, non-chrome, and unpainted parts: Polish with Mother's Mag and Aluminum polish. Works great.
For heavy corrosion. Use a chelate bath such as Evapo-Rust.
Also helps to have shop-towerls, rags, brass brush, sanding pen, sandpaper. etc.