The cover needs to be thoroughly cleaned two or three times a year.
Never use high pressure washers or chemical cleaning agents.
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                Let the fabric cover soak for at least 24 hours. 
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                After soaking, wash the inside and outside of the cover with a sponge or a soft brush. Use mild soapy water and plenty of water, max. 30°C. 
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                Rinse thoroughly with freshwater. Mix 12% vinegar in the final rinsing water to neutralize the soap residues. 
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                Hang the cover to drip dry.