وَسُنَّةُ الْغُسْلِ: أَنْ يَبْدَأَ الْمُغْتَسِلُ بِغَسْلِ يَدَيْهِ وَفَرْجِهِ، وَيُزِيلَ النَّجَاسَةَ إِنْ كَانَتْ عَلَى بَدَنِهِ،
Translation: The Sunnah of ghusl is to begin by washing the hands and private parts, and to remove any impurity present on the body.
These initial actions precede wudu and washing the remainder of the body.