Sins leave with the water
مَنْ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ خَرَجَتْ خَطَايَاهُ مِنْ جَسَدِهِ حَتَّى تَخْرُجَ مِنْ تَحْتِ أَظْفَارِهِ
Man tawadda'a fa-ahsana-l-wudu'a kharajat khatayahu min jasadihi hatta takhruja min tahti adhfarih.
"Whoever performs wudu and does it well, his sins leave his body, even from under his nails."
Narrated by Uthman ibn Affan. Sahih Muslim 245
A short reflection
Wudu is not only washing. Done with care, it is a quiet forgiveness five times a day, down to the fingertips.