greetings ... may i suggest either meguiars d103 all purpose cleaner or the p21s total auto wash at 100% ... i just had a similar situation and after using both products on 2 different spots i was finally successful in removing some of these pesky compound spots (use a toothbrush or very tiny detailers brush with hard bristles)
... got this tip from one of the kind forum members a while back
hope this helps