How can I delete from clip all formating and paste it as a plane text?
In order to paste as plain text use menu Clip -> Paste as Plain Text or press Shift + Enter to paste pure text directly to any application. In order to copy data as plain text to clipboard use menu Clip -> Copy as Plain Text or press Shift + Ctrl + Insert (or C). Press Ctrl+Shift+V to paste clip as plain text in one click.