Clear iOS Safari icon cache?
I've managed to refresh it by loading ./apple-touch-icon-precomposed.png, but I only had apple-touch-icon.png in my main folder and had deleted the outdated precomposed one, so I believe you have to go to the original address that was stored in iOS Safari's cache.

It could be any of the following addresses, which are recommended by Apple Documentation on Web Applications:


apple-touch-icon-precomposed.png
apple-touch-icon.png
touch-icon-ipad-retina.png
touch-icon-ipad.png
touch-icon-iphone.png


And don't forget to compress your PNG to save bandwidth!