My guess is you have all of your WordPress installs under the same user. One, or more, got exploited and it's leaking throughout all of your sites and the whole shared server. I'm surprised they haven't already turned your account off.
Your best bet is to get a VPS and move each blog over one by one, under different users, completely cleaning as you go. This is an extremely tedious task but once one user is exploited, the nuclear option is your only real fix.
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