I need to delete caches... it doesn’t delete itself on my phone

Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch

1. To clear your history and cookies, go to Settings > Safari, and tap Clear History and Website Data. ... 
2. To clear your cookies and keep your history, go to Settings > Safari > Advanced > Website Data, then tap Remove All Website Data.

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Clear the history and cookies from Safari on your iPhone, iPad ...

You may --> Clear Other storage on your iPhone or iPad - Apple Support (IN)