clear cache iPhone Safari?

I’ve read in old threads that WPT cannot clear the Safari iOS cache without the iPhones being jailbroken?
If true (and I’ve seen lots of results in my private instance that seems to back this up) is there anything else we can do about it? Our iPhones are running 12.x & cannot be jailbroken AFAIK.
Any workarounds or ???
thanks!!!
Mark