The following is a set of instructions on how to safely and efficiently clean a trumpet.  The methods described are those I have found to yield the best results.

Step 1: Before You Begin

Before you begin cleaning your trumpet you will need to gather and take stock of your supplies.  You will need a "wire-snake" brush, a mouthpiece brush, petroleum jelly, valve oil, a lacquer polishing cloth or a silver polishing cloth (depending on your trumpet's finish), several towels, and non-bleach dish soap (Bleach can be corrosive to the instrument's finish.).  These supplies are displayed and tagged above.  You will also need to decide on a wash basin, such as a bath-tub (recommended) or large sink.  The wash basin must have running, heated water and room for maneuvering the trumpet safely.  Be prepared to apply only lukewarm water, however, and not water that is too hot.  Very hot water could cause the trumpet's finish to flake.  You will be reminded of this every step.  Finally, acquaint yourself with the following terms if they're unfamiliar:

Bore - the interior chambers of the instrument that define air flow path
Lead pipe - the pipe connecting the mouthpiece and tuning slide; part of the horn
Bell - the final, conical section of the trumpet; part of the horn
Valve casings - the chambers that contain the valve pistons; part of the horn

Other important trumpet parts are depicted in the next step.
<p>Can I use Windex to clean it?</p>
<p>Do you happen to know what to do when the tuning slides are stuck, so badly it is almost impossible to remove them? (I use a rental trumpet, which was badly maintained)</p>
<p>after a few days of trying to fix my stuck slides I just made it. What i did was put oil WD-40 in the slide from the outside, then this morning I boiled water and pour it through the mouth pipe and in the outside of the stucked slide, the using a rod I was able to pull the slide.</p>
on my horn, the tuning slides are all dark with corrosion, just grimed up from years of smoky clubs, what is your best recommendation to get them back to clean brass? was thinking maybe wet sanding with fine grit sandpaper?
You sound like more of an authority than me. (My subject is actually economics, and I made this instructable for a college English class.) I remember my slides becoming dark from residue (not corrosion?); particularly the third valve slide which I oiled instead of greased. I tried scrubbing with the brush, but that never worked. I never tried using sandpaper; but I'm not discounting it. I took my instrument to have a chemical clean once a year and that always got the residue off. Perhaps that's what you were hoping to avoid; I know chemical cleans are expensive. But yeah, I'm not really a trumpet authority or chemical engineer lol. Sorry I couldn't help.
<p>for the petroleum jelly can i use cork grease</p>
Cork grease is probably better than petroleum jelly. I grew up in a small town without a music supplier so petroleum jelly was easier to find. From what I understand both work well and are commonly used.
<p>or you can use cork and tuning slide grease</p>
<p>I never thought to use petroleum jelly on the slides, but from what other websites say, it sounds like a good idea. I'll try it after I clean my horn today.</p>

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