Wudhu by Immersion
Useful information: Wudhu by immersion means that one should dip one's face and hands into water, with the intention of performing Wudhu. And there can be no problem in performing wiping with the moisture thus acquired, though it is against precaution.
Even while performing Wudhu by immersion, one should wash one's face and hand downwards from above. Hence, when a person dips his face and hands in water, with the intention of Wudhu, he should dip his face in water from the forehead and his hands f rom elbows.
There is no harm in performing Wudhu of some parts by immersion, and of others in the usual way.