Purely expressed fruit juice may be clear and contain natural water, but is still juice rather than unrestricted water.
It does not serve for wudu.
A slight trace of fruit material entering otherwise ordinary water is a separate mixture question, assessed by whether the water retains its identity.
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Unrestricted Water, Restricted Liquids, and Clean Admixtures
Purely expressed fruit juice may be clear and contain natural water, but is still juice rather than unrestricted water.
It does not serve for wudu.
A slight trace of fruit material entering otherwise ordinary water is a separate mixture question, assessed by whether the water retains its identity.