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

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

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 ...