Scuff mark from handle of Stanley knife - removal?

Joined
20 Mar 2009
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Potters Bar
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United Kingdom
Have had this once before but was hidden when re-siliconed!

Cutting old silicone out and handle of knife against the tile has left a thin black scuff mark along the length of the screen profile! Didn't even apply a lot of pressure and the part that made the mark was plastic!

Is it a scratch or a burn mark of some sort?

Tiles are snow white not gloss!

Magic eraser?
Barkeepers friend?

Any suggestions? My usual arsenal of clean up products won't touch it... I really thought nothing of it and that it would just wipe or buff off!

FFS!
 
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