right. but youre completely missing my point (and the point of this thread), which focuses on the notion of cleanliness. the side of the building is not any more clean or less clean due to the presence of paint, but the term has been appropriated to suggest that is the case. its a subtle way that the conversation is shaped and stereotypes are formed and perpetrated. i remember when a mural went up in a near western suburb in the late 90s. it was by a famous chicago street art and sanctioned by the business that put it up. its still there actually.
but you would not believe the pushback it got at the time, with people saying it was "too urban" (again, a subtle coded message for a deeper prejudice), and an effort to try to differentiate themselves from an area of the city just over the border they saw themselves as above. hell, paint your house the wrong shade of yellow or blue and you'll get almost the same level of blowback in many communities.
the irony is in the intervening years, the city has significantly expanded their mural initiative (and the battle long ago was lost in preventing the town from becoming "too urban" aka brown)
Today there's more appreciation for street art but the entire genre has it's roots as an unsanctioned form of expression, and people really seem to struggle with that