I just use the Craftsman Micro Cleaning Kit. So cheap you can't go wrong. But there's no soft camel hair brush in there suitable for film. You could easily make one yourself modifying one of those little attachments with a lens lipstick brush. I'd imagine something better is available for eletronics tech repair applications. Then you need to find an appropriate tapered step-down diameter sizing adapter, or "step adapter". Fein used to make nice pliable rubber ones. Don't get the hard plastic kind.