Stretched across the west wall of the New Santa Clara Market in the Lower Haight is a full 15 by 45 feet of political controversy, in both its intended content and the fact that it has become a magnet for graffiti.

Located on the southeast corner of Haight and Scott streets, Positive Visibility, as the mural there is titled, shows women suffering from the symptoms of HIV-AIDS. It was completed in 1995 by an artist named Juana Alicia, who learned her craft in part from two former students of painter Diego Rivera.

Reflecting a somewhat surreal departure from Rivera's own direct imagery, Alicia's painting (finished with help from other HIV-AIDS activists) contains a multitude of pastel colors applied in vigorous brushstrokes. In one segment, a tattooed drug addict accepts a clean needle from a needle-exchange worker. Another woman nearby wears a shirt with the queer pink triangle and the phrase "silencio = muerte." Three pig-faced corporate drug execs guard a prescription bottle, and a woman is kicking one of them directly in the face. Slivers of broken mirrors create a mosaic across the mural's top center.

The message: women contract HIV too. It's not unlike the hundreds of other politically charged murals most San Franciscans are proud to have coloring the city. But currently, Positive Visibility faces a cruelly ironic fate; it's half covered in a red paint used by the building's owner to rub out graffiti while awaiting a complex decision about how and when to restore it.

Alicia, who now lives in Mexico and has taught arts education and community organizing for 25 years, has also completed major pieces in the Mission District and at the San Francisco International Airport and the UCSF Medical Center. (She did not respond to an e-mailed list of questions.)

The problem is that Positive Visibility has been plagued by graffiti since it was completed — not spray-can lettering so much as haphazard markings. The entire bottom has been covered at times, sending neighbors into a furor and attracting citations to the owner of the building from the San Francisco Department of Public Works. Some of the graffiti has targeted the content of the mural in the form of angry expressions that the piece is antimale. One resident said she'd prefer that any existing mural at the spot reflect "the neighborhood's vitality."

"It's been very controversial," said Marc Shapiro, who lives nearby on Waller Street. "Some people want the mural. Some people don't. I didn't care what happened as long as somebody would maintain it.... The street has been so terrible for the last 10 years, you know. Nobody was maintaining the mural. So we had to live in a neighborhood with all of this horrible graffiti."

The Neighborhood Beautification Fund under then-mayor Willie Brown put up $8,000 to restore the mural in 2000, an effort that included several layers of what was supposed to be a special graffiti-proof varnish. It wasn't enough, and the graffiti continued.

"The final straw was when there were swear words — 'Fuckin' bitch,' 'asshole,'” said the building owner's son, Suheil Alaraj. "The neighbors were, like, 'We have children. We can't keep walking across the street and bypassing this.'” Shapiro added that sometimes attackers would throw entire buckets of paint on the mural.

Alaraj called ...