The ruling on moisture in clothing after waking from sleep

The questioner : Your Eminence the Shaykh! At times, after waking from sleep, I find moisture in my underwear. What is the ruling on this, given that it is not thick or anything else, but merely moisture?

The Shaykh : Yes. We have a principle, may Allah bless you, which I hope you all know. If we are in doubt about a state of ritual impurity, what is the default? If we are in doubt about whether the state of ritual impurity is major or minor, what is the default? Is it minor or major? It is minor, because major ritual impurity requires more purification than minor ritual impurity. So, if a sleeper wakes up and finds moisture on his clothing and does not know if it is from major ritual impurity or not, he is not required to take a full ritual bath. However, he should wash the clothing as a precaution. We might say he is required to wash it, because the fact that the obligation of the full ritual bath is lifted from him implies that the substance that came out is ritually impure, so he is required to wash it, but he is not required to take a full ritual bath.