Interruption of wudu.

If during wudu'ablution), one finds dirt stuck on his fingers, does working on removing the dirt by scrubbing it off disrupt the continuity of the wudu' and require repeating it?

Continuity would not disrupted by such action (according to the most viable opinion) even if his body had dried, because he was delayed due to an action required for his purity. The same is true if he were to move from one faucet to another in search of water.

However, if continuity were disrupted due to an action not related to his , like removing impurity from his clothes, eating or drinking and the like, and the limbs became dry, then he needs to repeat the wudu'.1

From the book What Should You Do in the Following Situations... ?

1 Fatawi ibn Uthaimeen 4/145-146 (Dar al-Qutni)