Cool water enemas. Or tepid water enemas.
I have give my kids enemas for fevers. They always worked. The fever went down. Few times I repeated the enema about fours after the first enema.
Gave with a small rubber bulb syringe. Now older given with the red rubber bag.
Before giving enemas or home remedies, check with doctor if ok to give.
My mom gave enemas as fever reducer. Always worked. Better than giving mess.