Don't know how to clear the browser cache (Firefox, Chrome, Opera, Microsoft Edge ...) (iOS)

1. Tap on the Chrome menu (the three vertically aligned dots in the top-right corner of the screen) and select Settings;
   
   

   
   
   

2. Tap on Privacy, select Clear Browsing Data, check (tick) the types of data you want to remove and tap on Clear Browsing Data;
   
   

      

1. Tap the three-parallel-line icon and select Settings;
   
   

    
   
   

2. Select Clear Private Data, move the slider of all the types of data you want to clear to the right and tap on Clear Private Data.
   
   

     

1. Tap the Opera icon and select Settings;
   
   

    
   
   

2. Tap on Clear, select Clear Cookies and Data and tap on Yes to confirm.
   
   

      

Temporary (temp) files, are files created to temporarily contain information while a new file is being made. After that, they are useless and occupy space. A few of them don't pose a threat; however, as time goes by, they can occupy significant amount of space, and slow down your mobile device.

To delete temp files and clear the cache, go to:

Settings -> General -> Usage -> Manage Storage -> Tap an item in Documents and Data -> Slide unwanted items to the left and tap Delete -> Tap Edit -> Delete All, to remove all the application's data (or install iCleaner or other similar applications, which you can find in App store)

One the latest iOS versions (starting from version 9):

Follow these steps to clean out unwanted data from iOS:

1. Tap on Settings, select General and tap on Storage & iCloud Usage;
2. Tap on Manage Storage;
3. Tap on an item in Documents and Data;
4. Slide unwanted items to the left and tap on Delete;
5. Tap on Edit and Delete All to remove all the app's data,
   
   

Note: The easiest way to clear the cache files is to install applications like Remo MORE, or Battery Doctor, which you can find and download via App store. Make sure to clear the cache at least once a week.