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It is even worse than that Paul. The Bayer filters on the chip ALL let IR through. How much depends on the manufacturer. That is why the colour washes out. As far as IR is concerned some chip manfacturers even go to great lengths to get superior 'night' vision with IR LED's by having the colour filters transparent to IR.
A simple example is the colour security camaras with built in IR led's that turn on automatically as ambient light level falls. The picture then effectively becomes B&W.
I think that Scott even noticed this with his modded 350D fitted with a 'clear' filter that IR affected all colour channels.
Bert
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