How to prolong the service life of safety shoes?

A pair of safety shoes, if the service life of the maintenance of good have have 1 ~ 2 years, if maintenance is not good, maybe a few months to submit an expense account. So how do we make safety shoes last longer? 1, new safety shoes can play a thin layer of shoe polish, placed in 1 days later. 2, after the shoe polish for safety shoes, don't forget to use paper regiment, tucked in the boot to keep boots the best posture. 3, safety shoes are maintenance once a week. 4, receive to make safety shoes clean before safety shoes, the best in the open air to dry 1-2 days, so it is not easy to mildew, aging. 5, don't wear the same pair of safety shoes for a few days, because safety shoes also need to breath, rest, to have a longer life expectancy, it is better to change to wear safety shoes.