both the apc and apc+ have the dilution ratio of 4:1 and 10:1. get two bottles and circle the dilution ratio of each on the back and you'll have two bottles to work with, whether you want to use the 10:1 for light interior cleaning or the 4:1 for tires, wheels, wells, engines, etc, etc,. yes, you can use the apc to clean pads as well...