Why can the edding 21 EcoLine permanent marker and the edding 3000 permanent marker be wiped off glass with water?

Water resistance on glass is problematic with almost all permanent markers. Glass is a difficult surface in terms of water resistance. Water can easily penetrate underneath the surfaces described and detaches them. It also depends on the type of glass you have and/or whether the surface is really clean and untreated or coated.

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