refreshing the speedometer/odometer

I think that while the engine is out, I'll grab the speedometer and get the face off and see if I can brighten the odometer wheels. The wheels are kinda dirty and it's hard to read the numbers even during the daytime. The speedometer ring number could probably use a little brightening too.

Has anyone tried this? I'm wondering if there are any kinds of cleaners that would help, or if there are any cleaners or solvents I should avoid using.

I promise to leave the odometer wheels at the current values! :tapemouth it's already at 23,000 anyway :pirate: