Is dishwasher cleaner actually worth buying for a small cafe

we run a pretty small cafe, like 4 tables, and the dishwasher gets used hard every day. its starting to smell a bit and theres some gross film building up on the inside. been just running hot cycles thinking thatd be enough but clearly not.

been looking at dishwasher cleaners but honestly not sure if its worth spending money on a dedicated product or if theres a cheaper diy route that actually works. anyone deal with this for a commercial-ish setup?