I would need your advise on where I could send my watch for careful cleaning of a 1940's steel - raised enamel dial. I know this should be done with great care to prevent losing too much details and character. Your experience with good restorers / cleaners is much appreciated.
I cleaned all my enamel dials with water and a cotton swab myself. I avoided the print just to make sure it doesn't break off the print. Cleaned off years of grease, rust, and dirt that way. Use only a damp swab. Not dripping wet. I also used alcohol for some weird ink stain on a white enamel dial, but water usually does the job.
Enamel is essentially glass. Very resistant to fading/changing from both sunlight and chemicals. I have a 99 year old Longines pocket watch with an enamel dial that could have been manufactured yesterday, it looks that new. As long as you don't apply a large amount of force (which will crack it), you should be fine to clean it with alcohol/water/detergent/soap.