check the bottom of the radiator is not bulging? it should be completely straight and looking from the back of thhe radiator facing the same way the car is check the lower left hand corner of the radiator is it corroded and visible signs of leakage?? this is one of the other common spots, lastly check around the thermostat housing for signs of leakage. if it's been topped up a lot then there probably won't be much anti-freeze left anyway so it staining the heatshields is now unlikely.
this is all assuming that it's not the worst case scenario of a head gasket..
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