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  

I asked ʿAisha about the clothes soiled with semen. She replied, "I used to wash it off the clothes of Messenger of Allah ﷺ and he would go for the prayer while water spots were still visible. "  

كُنْتُ أَغْسِلُهُ مِنْ ثَوْبِ رَسُولِ اللَّهِ ﷺ فَيَخْرُجُ إِلَى الصَّلاَةِ وَأَثَرُ الْغَسْلِ فِي ثَوْبِهِ بُقَعُ الْمَاءِ