To prevent nasty smells coming from the sink or shower drains in your caravan or motorhome, you can use a grey water treatment product like Thetford’s Grey Water Fresh Concentrated. This type of product is designed to prevent the buildup of grease, soap residues, and organic waste that can cause unpleasant odors in your grey water system. Simply pour the recommended amount of product into your drains and add water to keep your grey water clean and fresh. Regular use of a grey water treatment product can help maintain a clean and odour-free environment in your caravan or motorhome.