If you're talking about doing it yourself, a whole lot of elbow grease.
It really depends on how far you plan to take it apart will determine the method of removing the paint.
If you tear it down completely you can trailer it to a media blaster. If you just want to leave it whole and take the paint off, then you're looking at sanding it down which is where the elbow grease comes in.
I've used chemical strippers on race cars that were awesome. But they make a mess and if you don't have everything protected it can ruin things you don't intend to replace.
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