What is required is to make the water reach between the fingers and toes once, by running the fingers between them or otherwise. If the individual runs his fingers between the fingers and toes each of the three times he washes them, there is nothing wrong with that, but it is not a condition of wudu being valid. Rather what is required is to make sure that the water reaches between the fingers and toes at least once.

The Sunnah when doing wudu is to wash each part three times, and doing more than three times is overstepping the limits and is transgression. Even though washing the limbs more than three times is not allowed according to scholarly consensus, it does not invalidate wudu, because wudu has been done correctly by washing the limbs three times, and anything more than that is rejected, but it does not render it invalid.

What is required when doing wudu is to wash the limbs in the order that was narrated from the Prophet (blessings and peace of Allah be upon him). Based on that, whoever does these actions in the wrong order deliberately, his wudu is not valid. With regard to washing the right before the left when washing the hands and feet, that is not obligatory, because they are like one limb. The same applies to rinsing the mouth and nose whilst washing the face; it is not obligatory to pay attention to the order when doing them.

Wetting the hand and passing it over the limb is not regarded as washing it; rather it is essential either to dip the limb in water or let the water flow over it when washing it outside the vessel.