Metal prints have high-contrast and brilliant colors.  The surface can be cleaned as follows:

1. Use gentle wiping with a soft cloth (which can be moistened with water).

2. If you need more cleaning than step (1) provides, then, spray window cleaner [Windex (C) works fine] on a soft cloth (not directly on metal print) and gently wipe surface.

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NOTE: Even though the metal prints have a scratch resistant coating, avoid overly aggressive wiping as it might scratch the metal print surface.