Hi and welcome to Just answer.
If your machine is idle for 5 months and the water of the machine doesn't drained. You need to descale your machine, I think you have done the right thing. However, if still cloudy it means that the machine is not totally clean.
This is what you need to try, in normal descaling you just brewing the vinegar and rinse. Now try to shake your machine when the vinegar was penetrated inside the machine then rinse it.
If still, use Keurig descaler to descale your machine CLICK HERE. This descaler is fast acting,odorless and better than undiluted vinegar.
Hope this information will be helpful.
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Let me know,Chester