When to Wash Your Jeans
We'll get right to the point — you absolutely can wash your jeans if you want to. Phew. But that doesn't mean you should be washing them after every wear. "I would suggest reducing the frequency of washing your jeans to keep their color in place," Ryu said. "Washing your jeans every four to five wears should be enough for most pairs."
On the other hand, some say washing is OK but they prefer to do it as little as possible. "I try not to wash my jeans," Mazur said. "Sometimes it becomes necessary, but it is better to not wash them if you can." In other words, Mazur thinks you should only wash them as needed.
Adams-Geller also has a trick for if you don't want to give them the full wash but they're starting to feel stretched out: "Put them in the dryer for a few minutes with a damp cloth to freshen them up."