Simply wait for nature to take its course and then all you need to do is search the, uh... byproduct for the film.
I'd offer you my special lupus pupus scupus for the job, but I left it back at the airstrip. I'm afraid you'll have to conduct the... err... search the old-fashioned way.
Have you recovered the microfilm?
<Iggy holds his nose as he accepts the microfilm from you.>
Yuck, well, we've complied with section 8.2, paragraph B of the emergency protocol here and recovered the film. Nothing in the protocol says I'm responsible for cleaning it, though.