Think it´s not a question of the real thing. And I think there is no real thing, because Polka is a folk dance or country & western dance, but not a standardized ballroom style. So I dont want to fixate on the european way (triple-step to left and then triple-step to the right): all the guys in the following vid are dancing Polka and have fun! If you can lead you can improvise and change the steps as you like it: walking, turning, triple-steps to either side, intermediate steps alternating with triple steps, promenade steps. Anything goes. All what counts is to stay in the 2/4 rhythm, isn´t it.