Have you got a rubber case try this SKU 5083501 if one still dont work-
buy 2 and cut the back off 1 to add even more rubber,
push this cut part down the back so its 2 times thicker at the back...

or demagnetise the magnet with High Heat so the magnetism of the whole object decreases. Eventually whole regions of the magnet fail to be lined up properly and the magnet is demagnetized.
This temperature depends on the materials in the magnet and could be as high as 1390 degrees Fahrenheit (770 degrees Celsius) for low carbon steel, for example.

if you can remove them heat them up with a small blowtorch...