This question already has an answer here:
On OS-X it's Opt+Cmd+E or Cmd+R or certain menu options (How to clear the cache or do a hard refresh in Safari?).
Is there a way to do this for Safari on an iPhone or iPad?
This seems like a duplicate? What do you think? I really don't like force-quit: Can I force a cache refresh in Safari running on iOS?
This sounds better: How to clear browser cache for just one specific site in Mobile Safari?