Hmmmmmm..... Sounds to me like you fixed one of em, but another is out...
Hope that brake cleaner trick doesnt cost you a couple new wheel bearings,
might want to stop that trick, like now :)..... The abs does a self diag
test all the time, sounds to me if you got it to work except when the abs
comes on, you may want to pull and clean the rears... I would still be
suspect that one of your other sensors is right at the verge of in spec......