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We must do like Gohan's hero, Clean God, and restart Yomi's spin cycle! We must make the skies rain yellow once more!
But Yomi is a land of pollution, pollution is its nature. Despite what Shin and Kajika believe, purifying this land is killing it deader than the land of the dead should get. This is the realm where impurities get worked out in their own way in their own time.
Janemba was a result of the Celestial Bureaucracy cutting corners to meet quotas, working out impurities too fast too furious with their washing machine instead of trusting in the Yomi's yellow water cycle, which produces blue and red oni to propagate it.
There has also been speculation as to what oni are, as they fall outside the cycle of reincarnation. Their realm is where the dead go, but they are its wardens, and there is no way a soul going through dharma can become an oni.
>On the nature of hell and its denizens; Buddhavarman's fifth century Chinese translation of the Abhidharma-vibhāṣā-śāstra questions whether hell wardens who torture hell beings are themselves sentient beings, what form they take, and what language they speak. Xuanzang's seventh century Chinese translation of the Abhidharmakośa śāstra too is concerned with whether hell wardens are sentient beings, as well as how they go on to receive karmic retribution, whether they create bad karma at all, and why are they not physically affected and burned by the fires of hell.
Something that could explain why the servants of hell are the way they are, can be found in the kanji for the Hannya. Hannya means "Wisdom," and Wisdom is the opposite of "Ignorance." To know sin, you have to have experienced sin... or you can be comprised of sin. The phrase "Takes one to know one" applies here, making Oni and Hannya the embodiments of sin who punish the sinners.
So if we can get those servants of hell back up to snuff, they can run these demons out of here, and prepare the next generations of incarnated mortals for life from what spark Shin can provide to them.
Now, as to HOW Gohan could pull this off, Izanagi has the answer again! When he cleaned the last part of his body of the yucky hell gunk, the Sun and Moon were born from his eyes, and Storms and slime were born from his nose.
So,as Gohan we ask Kamiccolo the slug man how we can grow big. Then, we ask Shin to make a sun and moon to put up in the sky of hell. Then, while we're an Even Bigger Great Ape, we ask our Mom to get us a Great Lake's worth of tea, tea is a great diuretic that cleanses the body of poison. Then, we take all the impurities we've picked up here and put in the sword, and unleash those in our body. Then, we drink as much tea as we can, as much as the other thunder god Thor did that one time, and then we do as the other thunder god Zeus did when he sired Perseus and flooded the world all those times to repopulate it again and again.
Or we could ask Shin to make more magic clouds!