Leather sofa (refers to the leather sofa, not leather or other synthetic leather) is to be used during maintenance, including oiling. Of course, you do not need to wear shoes like shoes every day. You can buy leather (ie, sofa) cleaners, which can be both cleaned and lubricated
Genuine leather sofa in addition to daily care, but also regular cleaning, because the strong absorption of leather sofas, so even without stains, about 2-3 months should also use leather cleaning agents to clean the sofa, maintenance. Or use a household vacuum cleaner to suck the sofa surface dust.