Guys -
The best way to clean models, is not to let them get dusty in the first place. I'm not a prolific builder, and a good build can take weeks or months, depending on how much free time I can get. Those plastic display cases work wonders. Yes, dust can sneak in, not sure how , but it does. still a lot less than sitting on a shelf. If the model is already dusty, agree, a dry soft bush is step 1, step 2 is warm water, step 3 is warm soapy water. Haven't tried the paint polish, yet, but sounds good!
Good luck!
Archer out.