I have a client that stiffed me on monthly payment (I know get paid upfront). I took his site from #48 to #1 for 4 or 5 months. I control 90% of his good backlinks and have removed his backlinks from each site last month. But, 30 days later and those same backlinks are still "counting" for his site. Does anyone know how I can force the SERPs to notice that the backlinks no longer exist?