"clean appearance" is correct and can be used in written English.
For example: "Her clean appearance showed that she had spent hours getting ready."
However, the image of a clean appearance appears to be highly valued.
The plumage, like that of the waxwings, is smooth, giving the bird a clean appearance.
As Latvia is in the highly regulated European Union banking system, this final stage adds to the dirty money's "clean" appearance.
But its clean appearance (blond hickory booths and marble table tops), raw bar and open kitchen make it look more like a proper restaurant, as does the free-ranging menu.
To illustrate the collaborative environment, he cited the clean appearance of the MKZ's console, a look achieved largely by replacing the shift gate with buttons on the center of the dash, an effort that required interior designers and engineers to work together.
The included wireless mouse and keyboard apparently fold into the system for a clean appearance when not in use.
Its clean, white appearance decorates our winters and brightens even overcast days.
Lastly, there are many different local businesses that have company cars and that require clean appearances.
Given her bubblegum pop hits and her squeaky-clean appearance, the pop star comes off more as a perky teenager than someone the same age as Lady Gaga.
Nissan showed an all-new Sentra, with a clean, simple appearance.
Glass panels provide a clean, modern appearance, but shower curtains also have advantages.
