Well there is another point about being “clean”, that is being ethically clean. Doing good deeds and so on.
It brings you closer to G-d and his angels. And this again makes it much more probable to make g-d do miracles in your life.
At least that is my experience. Miracles are g-dly invention in and around you.
The cleaner you are, the more probable the miracles will become.
It goes through prayer and other ways to reach the angels.
This movement can be extremely potent. The closer you get g-d, the more power you get. Powers like prophetic powers, healing powers and so on.
In other words, it’s not some obligation you have to do. It’s a path of spiritual growth.
G-d bless the will of the angels to do good in this world.