By becoming a patron and adopting a Stolperstein, you undertake to care for the stone for a period of twelve months from the date you submit your request. You are free to conclude your commitment at any time, but please let us know if you do, so we can find another volunteer. You can adopt either a single Stolperstein or several at a single location.
You can clean the Stolpersteine as often as you wish, perhaps around International Holocaust Remembrance Day, Yom HaShoah and on the person's birthday.