Pasadena's Graffiti Abatement Hotline at 626-744-7622 and the offending tag will be removed within 24 hours. Sounds like a tall order, but so far I've seen it work every time.
I took this photo two years ago. I'm pretty sure this graffiti's gone by now. Sure, a new tagger will come along. But the City's got more paint.
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