How can I lighten the color of my leather boots?

A product called Afta can be used to remove some oils from leather. Instructions on the can. It is somewhat like older style cleaning fluid - may be the same. Anyway, follow up with conditioner.

Hi Catherine, hope this helps you lighten your leather boots. How Do I Lighten Leather?

1. Dip a clean cloth in leather deglazer or acetone, and wring out the excess product. ...
2. Rub the deglazer or acetone directly onto the leather piece.
3. Wipe off the deglazer with a clean cloth to remove the top finish coat. ...
4. Rotate to a clean section of the cloth or use a new cloth as the old one gets dirty.

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I don’t think you could unless you re dye them

I'd be really careful not to mess up the leather!

Take them to a shoe repair shop and ask them if it is possible. Look online for one in your town.