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Lens dirt problem



Has anyone noticed a problem with the zeiss lenses for contax that parts of the inner casing fabric fall onto the inner lens glass and stick to it as it gets older?

I have a 50mm 1.7MM that's now quite dirty with this, and it must eventually affect the optical quality. A couple of years ago I bought a 80-200mm MM zoom and was careful to check the glass was clean, but now, sure enough, a large fleck of lens case material has now attached itself to the inner glass. Is this the same with other brands? Isn't it annoying in an expensive brand like contax? I've also got a couple of older AE lenses and on these the problem seems smaller.