It's silver iodide, not sulfur iodide, and the amounts used don't really have a significant effect on the environment. Both silver iodide and frozen carbon dioxide can induce ice crystal nucleation in supercooled water clouds. If you have a supercooled cloud then you might be able to clear things somewhat in a thin cloud, because the ice crystals will be heavy enough to fall out the cloud.
If it's a water cloud where the droplets are above freezing, then seeding isn't going to do anything.
In general, the answer to your question is no, there is no way to remove clouds.