Good afternoon, my name is ***** ***** I will assist with your query today.
A cloudy film can be a number of causes, it can be due to hard water, too much detergent\soap, or not enough rinse aid.
Since you have highlighted your not seeing the salt being used, this would suggest the fault is due to hard water as the water softener (which uses the salt) has stopped working.
The unit is still under warranty, I would start by turning up the water softener to its highest setting, give it 4-5 washes and see if the salt appears to be going down.
If the salt doesnt go down I would look to arrange a service call under your warranty, you can arrange this by calling Beko customer services on 0845(###) ###-####/strong>, selecting option 1, they are open 8am-8pm Monday to Friday.