ironman10
Hello & Welcome to the Forum!
I am happy to hear that you chose to clean the 226e rather than "restore" it..
I prefer the previously loved look of my trains, some of them almost 100 years old.
I use Meguars(sp?) cleaner & polish on my tin plate & plastic trains that simple soap and water won't clean up well enough.
I have used a clear matt finish on older trains to protect what original paint/lithograph is left and/or to add a protective layer over other blackened or painted parts.
Applying an oil based product to any finished area, while acting as an anti corrosion agent will also attract and collect dust. (natural weathering)
Hopefully this is of some help, my suggestions are based on my experiences.
Any others willing to chime in with suggestions or experiences? 

Happy Rails!
Dave