When it comes to maintaining your garden bench, the best product to use will depend on the type of material it is made of. Wooden benches should be treated with a weather-resistant finish to protect them from moisture and sunlight. Metal benches should be cleaned regularly with a damp cloth and a mild detergent to prevent rust. Plastic benches can be cleaned with a mixture of water and vinegar. Always read the manufacturer's instructions and recommendations before applying any product to your garden bench.