Squeaky brakes

My 2005 R1200 GS has squeaky brakes. Maybe I should say, squeally brakes, like stuck pig squeally. It isn't just annoying, it is embarrassing. My mechanic has already tried sanding the leading edge of the pad - that worked for about three weeks. I pull up to a stop light, brakes singing off key, and the car driver next to me rolls down his window and makes a snarky but accurate remark about my brakes. I don't acknowledge that I've heard him, I pray for the light to turn green. I pretend I have earplugs in my ears, thank heavens I'm wearing a dark visor. 

A friend recommended this product: CRC Brake Quiet. http://www.crcindustries.com/auto/content/prod_detail.aspx?PN=05016&S=N 

Devin, the service manager at CalMoto, tells me gently that in his experience, squeaky brakes are often found  on bikes of non-aggressive riders. That would be me. His advice? A track day. Or, use the brakes instead of down shifting. Hmm, real soon now, I think I'll have some long stretches of open road where I can clean my brakes.