RIN Storage Box Yamazaki Jitsugyo Black Sanitary Storage Case Cleaner Cosmetics Small Items 4807 4808 Used for about a year and a half to store cleaning supplies. Washed and dried. While there is no deterioration, there are white spots like the ones in the photo on the sides. I don't know what caused them. They might come off if you scrub them with a cream cleanser, but I can't be sure. Please consider this before purchasing.