I have some old icon codes in < head> area, like <link rel="icon" sizes="48x48" etc. I wanna remove them, but i cant find where i have placed those codes. They arent in skin file "Globaltemplate". Where are they? 😄 

They're automatically generated from the images uploaded in the Web App section of the AdminCP.

Having various sizes of these icons are normal to ensure maximum compatibility with many devices and sizes of devices.