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Welcome Peter Badenoch! Please see below the guidance on how to clean your system as mentioned on page 22 of the manual here:
• Clean the surface of the system with a soft, dry cloth. You can also lightly vacuum the grille on the system.
• Do not use any sprays near the system. Do not use any solvents, chemicals or cleaning solutions containing alcohol, ammonia or abrasives.
• Do not allow liquids to spill into any openings
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