'Hidden caches' targets cache like files that are in non-default cache directories, e.g. It removes unused files from your system, allowing Windows to run faster. Highest likelyness is the latter – which seems to be confirmed by the SD Maid wiki¹: CCleaner 2655 Freemium Proprietary System Cleaner Mac Windows Android Android Tablet CCleaner is a system optimization/cleaning tool. No straight answer, sorry – but my guess is it's referring either to the first or to the last of these 3 options. Now guess what 'hidden' means here? sdcard/Android/data//.cache – a hidden directory (leading dot in the name) called. Which suggests there's some special hidden cache partition somewhere – or the writer of that answer got it a bit wrong (which I think is the case).Ī third variant: Some apps create 'hidden cache folders' on the SD card. … but other then that it's all saved on hidden cache partition. The method is pretty small so it does not increase the size of APK much. Quoting (emphasis mine):īy default, Android Extensions adds a hidden cache function and a storage field to each container (Activity, Fragment, View or a LayoutContainer implementation) written in Kotlin. This developer article might give some insight.

a cache directory inside the apps' private space in /data/data/).

I would guess they refer to the apps' 'private cache' (i.e. the cleaners of Avast and AVG – so it seems this isn't specific to the app.

Ccleaner for android