I periodically get messages telling me to clean up my phone, but I'm unsure what exactly the cleaner deletes. I dont want it to delete any of my photos, WhatsApp messages or my other information, but it appears to want to delete quite a lot. It wants to delete 295MB of data from the Gallery, which seems like a lot and I'm not sure what it could be deleting. Is it photos/vidoes or is it just temporary files? It also wants to delete small amounts of data from other programs, like 389KB from WhatsApp, and again I'm not sure if it's messages or just temporary files. It wants to delete 426MB from the System Cache, which again seems like a lot and I'm not sure what it is. I'm always scared to run the cleaner becuase I don't know what it's deleting and I don't want to lose any of my data. Does it delete personal files or is it just temporary system files?