I have several bottles of KOS shaving oil and I've used it many times in the past when I used canned foam and carts. My question is if it's OK to use shaving oil with soap/cream and a badger brush? Is it usually easy to rinse from the brush when finished? And does it improve or detract from, let's say, Proraso in the bowl or Musgo in the tube (I have both). Any advice is appreciated.