The Messenger of Allah (May peace be upon him) used to take a handful of water and pour it on the fluid. Again, he would take a handful of water and pour it over the fluid.  

عَنْ عَائِشَةَ فِيمَا يَفِيضُ بَيْنَ الرَّجُلِ وَالْمَرْأَةِ مِنَ الْمَاءِ قَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ يَأْخُذُ كَفًّا مِنْ مَاءٍ يَصُبُّ عَلَىَّ الْمَاءَ ثُمَّ يَأْخُذُ كَفًّا مِنْ مَاءٍ ثُمَّ يَصُبُّهُ عَلَيْهِ