n safari simply use alt-cmd-R
you can see that in them menu...
with alt "Reload Origin" changes to "Reload Page from Origin"
The problem is that its not me but the clients.
And Safari option is actually not a default option. You have activate it in the advanced preferences.
As far as I remember it was a default option before and ther ewas also one called NoCachingso that you could disable the cache.
But anyhow you can not tell 1000 visitors a day that they may need to go through a special walk through the preferences to do it if they got errors like the one i just had with a black page in Chrome.
I have no idea how bad the problem is in Windows. IPad seems to be Ok from server. IPhone fails sometimes.