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Use three to five drops of a mild soap such as a facial cleanser or a soap made specifically for leather, and dissolve them in one quart of warm water. Mix until some suds are visible on top. To make your detergent, consider using distilled water, which can be purchased at most supermarkets. Distilled water is free from chlorine and other contaminants in tap water that could cause markings on your leather. Using a clean microfiber cloth, dip a corner into the detergent and apply it to a small, inconspicuous area of the bonded leather piece. Use a dry portion of the cloth to wipe away the detergent, and check to see if it picks up any dye or causes the fabric to thin and fade. If the detergent impacts the leather in any way, do not proceed with cleaning. Contact the manufacturer for recommendations on how to clean that particular piece. Once you know your detergent is safe to use on your leather piece, soak a microfiber or other soft-textured rag in the detergent and wring it out thoroughly. Section-by section, wipe down the surface of the leather piece with the detergent-soaked rag. Then, rinse off the section using a second rag moistened with distilled water, but free of detergent.  Continue this process in sections until your bonded leather piece has been completely cleaned. You may need to wipe over sections multiple times with the non-detergent rag to fully rinse it. Continue to wipe down the surface until any sudsing has stopped and soap residue is no longer visible. Use a third clean, dry towel or cloth to wipe away any excess moisture from the surface of the bonded leather. Then, allow the piece to air dry in an area with limited natural light. If it is a furniture piece, consider closing blinds or curtains while the piece is drying. Minimizing exposure to sunlight helps prevent cracking and separation of the leather pulp from the backing.
Create a mild detergent. Test a small area. Wipe down the piece. Dry the surface.