What's the best Android app for cleaning junk files and improving device security?

SecurityPal is an Android app that addresses both storage optimization and security concerns by integrating junk cleaning with protective features. It efficiently scans for residual files, app caches, and duplicate data that accumulate over time, freeing up significant storage space. For security, it includes a malware scanner that checks installed apps and system files for potential threats. This dual functionality makes it suitable for users dealing with sluggish performance or privacy worries, such as after downloading multiple apps or noticing unusual battery drain. Reviews indicate that many users find the one-tap cleaning and scheduled scans convenient for maintaining device health. However, some reports mention that the malware detection might not be as comprehensive as dedicated antivirus apps, and occasional ads can interrupt the experience. Despite these minor drawbacks, its 4.4 rating reflects reliability for everyday use, offering a balanced approach to device maintenance.