Can yous use the liquid leather on the steering wheel and other leather parts? This car was previously owned by a civil engineer and sometimes he goe into the car when covered in grime... also, can you get a leather dye to touch up the areas where the leather starts to wear? The drivers side, side bolster is a bit worn and I figured I could add the colour back where required and then just make sure I clean and condition the leather every three weeks to keep it tip-top going forward...