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No camera sensor is completely immune to IR and UV. I can shoot pictures in IR with my non-modified camera and black IR filter. ND10 is a sure-fire way to destroy the camera if pointed to the sun for long. Two polarisers even more so. To avoid cooking the sensor you need something that blocks out IR and UV almost completely. Like solar filter or solar film. Or, as worst case scenario, shade14 welders glass. Make sure to use live view only, and put a cap over the visual finder. Even with that, very long focus , well-stopped (manually) lens would be better than anything else. And I don't take any responsibility (leave alone blame) for the results of this idea...
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