CHIBOJI Used about twice and then stored. The piston cylinder is not dirty, so I haven't washed it, but the sliding is not as smooth. According to the official manual, using household cooking oil should improve the sliding. Please be aware of this before purchasing. The box has a small tear. I will take the item out of the box, fold the box, and wrap the item in bubble wrap for shipping. Purchased in 2022. #chiboji #runnynose #nasalaspirator #noseaspirator