Cloudy urine usually means that it is high concentrated with proteins(after a good meal or after the night sleeping). Also it may show an infection from microbes but then you should have some other symptoms such pain when peeing, maybe fever, polyurea, dysurea etc. Finally sometimes dust can make a cloudy urine, especially when the sample is not given right after you get it, but over 30 minutes later. I personally believe it is proteins. If they told you it is clear, and an urine culture shows nothing then it is clear, believe it!
Dr Herb