Limescale build up in washing machine

Having just bought a new LG washing machine, it recommends a tub clean every month to get rid of any limescale build up.
Are soda crystals good for that? One LG video says "if desired add a bit of soda" while another LG video recommends their LG ScalGo powder. Or maybe add soda crystals to each wash instead of a monthly tub clean? I think I read soda crystals work as good as Calgon?
 
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