In most cases, uninstalling and reinstalling the app will remove the app cache data. However sometimes, when you reinstall an app it doesn’t remove the old app. Therefore you will need to follow the below steps (device dependent):
Android
Open the Settings on your device
Tap the Storage heading to open the settings page
Tap the Other Apps heading to see a list of your installed app
Find the application you want to clear the cache of and tap its listing
Tap the Clear cache button
Reinstall the app
Amazon Kindle
Open the Settings menu on the Kindle
Find the relevant Doodle app
Tap on Storage, and then tap on Clear Cache
Once you have done this, please reinstall the app
Apple (iPad/iPhone)
Tap Settings > General > Storage & iPhone Storage
Find the app and tap
Then press Delete app
Go to the App Store to re-download it
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