Re: Honda - leather cleaning
1Z leather care and optimum leather protectant have limited cleaning abilities. If you're leather is in good shpe, you can maintain it with these products. However, if the leather gets fairly dirty, you'll want to go with a dedicated leather cleaner(wolfgang, pinnacle, etc..), then follow with a protectant(optimum, 303, etc..).
FWIW, 90% of auto leather is treated(coated).