Safari:
To clear cookies for a single site in iOS Safari, go to Settings > Safari > Advanced > Website Data, wait for the list to load, search for the site, then swipe left on it and tap Delete. This removes stored data for that specific website without clearing your entire browser history or logging you out of other sites
To clear cookies for a single site in iOS Safari, go to Settings > Safari > Advanced > Website Data, wait for the list to load, search for the site, then swipe left on it and tap Delete. This removes stored data for that specific website without clearing your entire browser history or logging you out of other sites