Mytee dirty

What are you Mytee guy's using to clean the exterior of your machines when the need a heavy cleaning?
Quick spray n' wipes are no longer effective. Seems to be a dirt build up that needs something more aggressive, especially on the blue surface. Thinking a mild abrasive like SoftScrub or even a powder abrasive like Ajax, but do not want to risk "clouding" the surface by being too agressive.

Any recommendations based on experience??