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Mix one ounce of leather bleach and one pint of water. Apply this mixture to your boots using a stiff brush. Scrub vigorously to remove any dirt that is on your boots. If you do not have any leather bleach, use a leather cleaner to remove any dirt.  Take the time to thoroughly clean your boots. The more dirt you remove, the better the final outcome will be. Use circular motions as you scrub your boots. Once your boots are clean, you must remove the protective coating. Your boots were likely treated with some type of protective finish when they were initially dyed. A deglazer will remove this coating so the dye can be absorbed. To get the best results, you need to remove all of this before you apply the dye. Use a wet cloth or sponge to rub the deglazer all over your boots.  The finish and some of the color will come off when you apply the deglazer. You may want to do this outside because the fumes can be very strong. Use a white cloth or rag because you do not want the color from the rag to bleed onto your boots.  Use a toothbrush to get the areas between the sole and upper. Wait for the deglazer to evaporate. This usually takes about 10 to 15 minutes. Once your boots have dried, run a damp rag over your boots to make sure you that you have removed all the protective finish. If you still see some shiny areas on your boots, you need to deglaze them again.  Removing the protective finish is critical to a successful dye job. The dye will not penetrate your boots if the protective finish is still there. If you have to apply the deglazer multiple times, you may want to let your shoes dry overnight.
Clean your boots. Apply a deglazer/preparer. Allow the deglazer to dry.