All Dutch and Belgian Stolpersteines are included in the Stolpersteine.app database (over 10,800 Stolpersteine in >265 cities) You can now include Dutch and Belgian Stolpersteines in your own website. The card is available in Dutch, French and English.
‘To remain visible and respectable, they should be cleaned at least once a year.’
The brass top of the Stolpersteine oxidizes over time, causing them to discolor from brown to black. Stones that lie in a busy shopping street sometimes remain reasonably clean due to the polishing effect of walking feet. To remain visible and respectable, they should be cleaned at least once a year in other locations, but rather more often.
Demnig recommends using a copper polish such as Brasso for maintenance. To avoid staining the surrounding stones, this product should not be applied directly to the stone, but rather rubbed with a soft polishing cloth or cotton tea towel. It can be rubbed after a maximum of one minute of drying. If necessary, this should be repeated several times. Optionally, a toothbrush can be used to clean the inscriptions. After cleaning, the polish residue can be removed with water and a brush or washing-up brush. If the stones are very dirty, more intensive treatment may be required. A strong all-purpose cleaner (with ammonia) can be used for this with the help of a scouring pad. To remove limescale stains afterwards, undiluted cleaning vinegar is suitable. In this case it is recommended to use a kneeling pad to protect the knees. The stones can also be cleaned with a tent cloth polishing disc (on a drill) and pre-treatment paste and then treated with a wool polishing disc and gloss paste.