they just need sterilising in the same way as most bottles, ideally rinse them out after use so any sediment doesn't dry as this is then harder to clean later, then when you come to clean the bottles before filling, wash with steriliser and rinse in clean water, ensure the caps are well washed especially around the rubber seals, and allow to dry. The washers can be removed if needed, and spares are available if they need replacing;
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they just need sterilising in the same way as most bottles, ideally rinse them out after use so any sediment doesn't dry as this is then harder to clean later, then when you come to clean the bottles before filling, wash with steriliser and rinse in clean water, ensure the caps are well washed especially around the rubber seals, and allow to dry. The washers can be removed if needed, and spares are available if they need replacing;
http://home-brew-online.myshopify.com/collections/all/products/washers-for-swing-top-grolsch-style-bottles