Cleaning Gummed Cox Engines

Here are some tips for cleaning.
For removing dried up Castro oil and fuel and cleaning the inside of the cylinder and other internal parts any 15% nitro fuel or better and a good stiff toothbrush or a Q-Tip works. I buy medical or dental grade because they are stiffer and don't fall apart that easily.
If you take a bright flashlight you can shine it down the needle valve opening on a radial back plate and look through the venturi to check for clogging. A sewing needle works great for clearing it. Glow heads tops can be cleaned by chucking one up in a Dremel and using 320B waterproof sandpaper or something similar.
For polishing the silver colored parts Mother's Mag and Aluminum Cleaner is the hot ticket. For back plates I use Wight's Copper Cream and a Q-Tip.