Unfortunately CCleaner is unable to be used on iOS devices, including the Apple Watch, iPhone, and iPad. This is due to a sandboxing requirement introduced by Apple.
Please note: There are some apps on the iOS App Store which claim to be CCleaner Free and CCleaner Professional.
We can confirm that these are not Piriform's products, and we are working with Apple to have these removed.
If you or someone you know has purchased this app, you are liable for a refund from the app store and you can find out how to do this here: