No, it is generally not safe to put an unfinished wooden cutting board in the dishwasher. Dishwashers use hot water, powerful jets, and harsh detergents to clean dishes, which can be damaging to unfinished wood.
Unfinished wood is porous, meaning it can absorb water and moisture easily. When exposed to the high temperatures and prolonged water exposure in a dishwasher, unfinished wood can warp, crack, or split. Additionally, the harsh detergents used in dishwashers can strip away natural oils and protective coatings that might be present on the wood, further compromising its integrity.
To care for an unfinished wooden cutting board and extend its lifespan, it's best to clean it by hand using a mild dish soap, warm water, and a non-abrasive sponge or brush. Avoid soaking the board in water or immersing it fully, as this can lead to swelling and warping. After washing, immediately dry the board with a clean towel to prevent moisture from seeping into the wood.
Periodically, it's a good idea to apply food-grade mineral oil or a specialized cutting board oil to nourish the wood and create a protective barrier. This helps maintain the appearance and durability of the cutting board.
If you prefer the convenience of a dishwasher for cleaning cutting boards, consider choosing one that is specifically labeled as dishwasher-safe. These cutting boards are often made from materials like plastic, bamboo (with a food-safe finish), or other non-porous materials that can withstand the dishwasher's conditions without damage.