How to Bathe a French Horn

Last Updated: April 5, 2021 Approved

It may seem simple, but these are delicate instruments and it's easy to get wrong! Little mistakes can cause huge problems and be massively expensive to fix, so it's best to avoid the mistakes in the first place.

Steps

1
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.)^{[1]
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2
Fill the bath with lukewarm water.

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3
Remove all slides, mouthpiece and any other moving parts from the horn. (If it has a detachable bell, remove this.)^{[2]
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4
Submerge the horn completely in water and press down all valves to open them (just a couple of times, you don't need to keep them down.)
5
Leave the horn for an hour to around three hours (only if it is an instrument that hasn't been bathed in a very long time, or if the valves are stuck down.)^{[3]
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6
Get a snake to clean the horn. While the horn is soaking, use a pull-through (snake) to clean out all your slides in a separate sink. If the pull-through is too wide to get round the bends in the slide, don't force it. It will get stuck and just cause damage. Try a trumpet or clarinet-style pull through instead. Use a mouthpiece brush to clean out your mouthpiece just now as well - no point in blowing all your mouthpiece gunk down into your nice clean horn!^{[4]
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7
Finish cleaning. Now for the nasty bit. When bath-time is almost up, put your pull-through through your lead-pipe (from mouthpiece end to tuning slide) and then use either the end of your pull-through or a similar smaller brush to clean out all the valve-slides.
8
Remove your horn carefully from the bath and tip all the water sitting inside of it out. You should be able to hear any water sloshing around inside but if you are having trouble getting it out try depressing all the valves and tipping the horn round 360 degrees towards the bell - any water should come out of the bell!
9
Dry the horn. After making sure you have gotten rid of any water sitting in the valves, lay your horn on some towels or another clean sheet to dry. Remove any surface water with a clean cloth or towel and then leave the horn, preferably in a room with some circulating air for a few hours to dry out.^{[5]
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10
Wait a few hours then tip your horn out again to remove any water that has settled.
11
Pour some low-viscosity valve oil down the slides into the valves, and oil all the bearings and rotors.
12
Re-grease all slides and replace them.^{[6]
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13
If you have a detachable bell, use graphite from a pencil as lubricant for the threads.

Community Q&A

Question

How often do I have to clean my French horn?

Community Answer

Wipe it down every week. Rinse/snake out the slides every month, and bathe it about every 2-3 months. Get it professionally cleaned once a year. Also, make sure you grease the slides once a week and oil the valves every two days.
Question

Do I soak the slides and valves as well?

Community Answer

You definitely soak the slides. You will need to reapply grease though. You can soak the valves, but make sure that after you finish cleaning, you spin it around as many times as you can while pumping the valves (without slides put in) to make completely sure there is no water left.
Question

What happens if I don't reapply grease after bathing my French horn?

Community Answer

It will be harder to move the slides if you don't reapply grease. If you're returning it to school you don't need to do it, though, just put all the slides in a plastic bag.

Warnings

Avoid using water hotter than lukewarm. On older horns, hot water will cause the lacquer to bubble and peel off. With newer horns this shouldn't be a problem, but it may not be worth the risk.

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