It is strongly discouraged to grease riding boots. The purpose of greasing leather is to keep it smooth, soft and nourished with leather soap after cleaning. This may be necessary for saddles or snaffles to maintain the durability and suppleness of the leather. With riding boots, however, this is an absolute no-no. To leather boots, the motto "less is more" applies! In fact, cleaning your boots with leather soap and leather grease will damage them. This is because greasing the boots softens the leather, which causes them to lose their shape more quickly and increases the strain on them. Therefore, you should simply clean them with water and polish them with shoe polish. This is perfectly sufficient for your expensive footwear. If the boots do get very dirty or wet, they should be cleaned with a soft brush to remove the mud and should be placed upright so that they can dry with boot stretchers.