Here's a lengthy discussion.
http://petoftheday.com/talk/showthread.php?t=159956
It's often called Persian Dirty Face, because the dirt and food gets trapped in the long hairs around the mouth, it is not limited to Persians and is referred to as cat acne.
You can soak the crusties off rather than using a brush which may irritate the area even more and you dont want it to bleed, and risk a deeper infection. Just keep bathing gently with warm water and a textured cloth (like a face cloth, it does take time though.
Once you get it under control, the key is to keep the area clean and free of debris (food and dirt) by washing / gently bathing the area routinely. I have one cat that is chronic, she used to have frequent outbreaks, by washing her wee face every day or every other day, I avoid the outbreaks and she tolerates the washing much better than the outbreak cleanups.
I do, and have always used stainless steel dishes, I have four persians, and only one is chronic even with the precautions, she'll have an outbreak if I fail to keep it clean.
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