The number has increased! This is 150 empty containers of Meiji R-1 yogurt. We drink it every day as a family, so they accumulate. I wash the drinking spout and inside thoroughly with dish soap and rinse. After air-drying, I wipe the outside with disinfectant wipes. I wash them carefully, but sometimes there may be white water marks. Please understand that these are stored and inspected by an amateur. Thank you for your consideration. I will ship them in a reused cardboard box.