I used to wash the traces of Janaba (semen) from the clothes of the Prophet ﷺ and he used to go for prayers while traces of water were still on it (water spots were still visible).
كُنْتُ أَغْسِلُ الْجَنَابَةَ مِنْ ثَوْبِ النَّبِيِّ ﷺ فَيَخْرُجُ إِلَى الصَّلاَةِ وَإِنَّ بُقَعَ الْمَاءِ فِي ثَوْبِهِ