Here is an article to clear history and cache from Safari. You can use the shortcut keyboard or with Safari interface

I. Using Keyboard Shortcut.

Press Button Command + Shift + R

Remove All Websites Data - clear now

II. Using Safari Interface.

Step 1. Click button on right top side panel Safari, and select "Preference".

Step 2. Select Privacy - Remove All Website Data

Step 3. Remove Now

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