sometimes white marks appear on the shoes made of leather but what causes that?
- Shoes protect your feet from the elements and make them more comfortable. On the other hand, if you do not properly care for them, they have the potential to ruin your shoes. When your shoes get older, the natural oils inside them dry out, which makes it more difficult to clean and preserve them. After some time has passed, a layer of dirt may begin to form between the leather and the sole, resulting in the formation of ugly black splotches and stains. Applying a waterproofing spray to the shoes before putting them on will prevent this from happening.
- Leather shoe bottoms need to be cleaned on a regular basis. When cleaning your shoes, remove the shoelaces first, and then soak each shoe in a bowl containing warm water and dishwashing liquid individually. After soaking them, allow the shoes to dry naturally, then proceed with the cleaning process using new water and soap. If you notice that the stain has not been removed, you might try rubbing alcohol on the affected area and then allowing it to dry completely. After that, condition the leather with some leather conditioner and let the shoe dry completely. Continue doing this step until the color is back to how it should be.
- Polish the edges, toes, and heels of your shoes by using a buffing wheel or a cloth. If you want them to keep their luster and attractiveness for as long as possible, you should probably polish them at least once a month.
- Refrain from wandering around barefoot on dusty floors or surfaces. It is possible for dust particles to accumulate underneath your shoes, which will cause your footwear to get dusty and discolored. When moving around the house barefoot, wearing slippers might help to protect your feet from any hazards.
- Always wear socks under your shoes to protect against foot odor and bacteria and to help protect your feet from getting dirty.
The 24th of October in 2017 Why do my boots appear to be cloudy and white? 1 REMARQUE ADDED Why do my boots appear to be cloudy and white? There might be something else on the surface of your boots that smells funky, and it might not be mold or mildew. It is in your best interest to find out exactly what you are up against so that you are prepared to deal with it. 
There are two primary factors that can cause white stuff to appear on the surface of your leather boots or shoes: The development of microscopic organisms, such as fungi or bacteria, on the surface of the leather, or Crystallization on the surface of the leather caused by oils or salts that have migrated from deeper within the leather. How are you going to identify the strange substance that is on the surface of your leather? If your boots have been stored in a damp place or were put away wet, and if they smell like mold or mildew, it's a good bet that you're dealing with fungus and/or bacteria growing on the leather of your boots. This is especially true if your boots have been stored in a damp place. In the first part of this series, we talked about ways to combat bacteria and fungus. It's possible that the foul white haze on the surface is "fatty bloom" or "fatty spue (spew)," as long as you're quite certain that moisture hasn't been an issue and your boots don't smell rotten. This white "bloom" is caused by fats, oils, or waxes that were employed in the tanning process and have begun to move through the leather and crystallize on the surface. These substances were used to tan the leather. These oils and waxes will typically migrate to the surface of the leather whenever there is a shift in either the temperature or the humidity. When you unpack your boots after having had them in storage for a time, you could notice a cloudy white appearance inside of them. The waxes and oils that you may have used as a dressing on your boots or shoes can sometimes cause a white bloom to appear on the surface of the leather after a while. 
It's important to note that although we're discussing footwear in this particular context, the blooming effect can occur on any oil-tanned leather product. It's possible that your leather purses, belts, coats, and other leather products will take on a milky white or hazy appearance. The most important fact to keep in mind regarding fatty bloom is that it does not cause any damage to the leather. This is true regardless of whether the bloom is caused by internal oils or external oils. It really kind of takes away from the overall beauty of the leather. How to proceed: In many cases, the bloom can be removed by applying a tiny amount of MooBuzz® Natural Leather Protection to the affected area with a gentle but robust cloth, such as an old towel, and rubbing it vigorously. It is also possible to assist the oils in moving back into the leather by warming it up with a hair drier or another type of heating equipment that operates at a low temperature. Be careful not to apply too much heat! It may cause the leather to deteriorate. When it comes to applying leather oils, balms, waxes, and polishes, it is important to keep in mind that less is more. When caring for your boots, make sure to wipe away any surplus dressings. If you don't, you might be astonished to find a white buildup around the seams. It won't hurt you, but you probably won't find it especially appealing. 
Salts may also contribute to another sort of bloom known as "salty bloom," which can occur as a result of the tanning process for leather. If your boots become wet as a result of rain or sweat, you may notice that a salt line has formed on the upper surface of the boots. This salt is moving its way to the surface of the leather from deeper into the material. In most cases, all that is required is a moist towel to remove it. If you use an excessive amount of water to get rid of the salt, you can end up making more salt stains emerge. After the salt has been removed and your boots have been dried, you can make them appear even better by applying a little bit of MooBuzz to them.