How to erase all GLINET stuff and just get raw OpenWRT?

I have 750S. I just want to erase all the stuff that comes frm GLINET and start with fresh open wrt image nothing from GLINET how do i do i am confused all these versions “clean” “v1” “nand” etc…

clean is their vanilla openwrt build.

Oh this is new too - very nice @alzhao :sunglasses: