what we use is a type of AP (all purpose) cleaner and then we use a leather conditioner but the majority of cleaners and chemicals we get are from a detailing/chemical supplier. Some of the stuff we use though is by "Mothers" they make good products. I know they make a cleaner/conditioner for leather and other surfaces. You can get it at auto zone, advanced auto and ect. I think its like $8-$10. You can get some armour all wipes and wipe it down really good and then spray the Mothers into a cloth and wipe it down really good and work it into the steering wheel. Dont use plain warm water and soap. IDK what type of soap you were talking about but most soap is too harsh cause of the chemicals and detergent and isnt a good idea for cleaning your leather or car with. I at least wouldnt ever do that lol if youre looking for a good wax too try Mothers reflections advanced wax, we use it for black cars.