Hi,
I just finished watching the grindhouse release and it was wonderful! It really took me back, I remember as a child watching a film, during the first week it was pristine, then on my second viewing a week later I noticed a few specs of dust, then on my third viewing I noticed that more had joined. This doesn't bother me, I see it more as a physical history of the life of the print.
I do have one question though. Will the finished release be physically cleaned? I assume you will be using software to paint away the dirt, but will there be any attempt to physically get some of the dirt off the print beforehand?