What happened to "Clear Cache?"

I really liked this app, but recent updates have included some big steps backwards. For instance, we used to be able to clear all photos from the cache, and now the option seems to have gone missing. It seems my only recourse is to delete the app and re-download it. There needs to be a "clear cache" button to keep this app from eating hundreds of megabytes of storage on my phone.

PyroRaptor about Astronomy Picture of the Day, v3.2