Is the wetness that comes out after bathing and ablution nullifying to ablution, or is it merely drops of water from bathing?

Whoever performs ablution is certainly pure, and the default is that the ablution remains valid. It is not obligatory for him to repeat it merely due to doubt, for the principle "certainty is not removed by doubt" is based on the Hadith of the man who complained to the Prophet, peace and blessings be upon him, that he felt something during prayer. The Prophet said: "He should not leave (the prayer) until he hears a sound or perceives a smell." If you are certain that the wetness is urine drops, then ablution is obligatory, and you must wash what it touched, otherwise not.