HEy guys, I am really new to all this. I wanted to do the simple task of flushing my HOnda Civic's radiator but I couldn't open the radiator plug. It was a plastic protrusion at the bottom of the radiator with butterfly wing like flps...i treid using a plier to turn it but I stopped as it wouldn't budge and I was afraid I would break it....can anyoone here tell me how to open the radiator plug so that I can flush it?