What happens next?

How to bathe a french horn
Find a bath big enough to comfortably take your horn and line it with an old sheet or towels.
( this prevents damage to horn and bath. )
Fill the bath with lukewarm water.

Options:
a). Add some mild detergent (like filtered water) and immerse yourself in the water. Swish it around for about 10 minutes; you can rinse with the cool tap only--it is crucial that you don't overfill your horn..
b). Remove all slides, mouthpiece and any other moving parts from the horn. ( if it has a detachable bell, remove this..
c). The water is cold enough to work well, but not so warm that it drips down the horn. Lay your horn at the bottom of the bath..
d). Hot water will warm up your horn and make it safer to use, it also will help repair your horn's durability. There are numerous ways to use a french horn, but most of the easiest is to base it on how warm the water is-using warm water might help soften your horn's durability as well..
b).