White Hydro Flasks can get dirty easily if you don't take care of them. However, because of the paint they don't stain easily. You can wash off dirty and marks in warm soapy water with a dish brush and it'll look good as new. Dents and scratches do become visible on the white paint and you can't wash these away.

How do you clean a white Hydro Flask?

Use white distilled vinegar for cleaning: You can use household white distilled vinegar to help remove any stains or discoloration on the inside of your flask. We recommend putting the ½ cup of vinegar in your flask, gently swirling the vinegar around to wash any affected areas and let sit for 5 minutes.

Why does my Hydro Flask get dirty?

Hydro Flask lids also get dirty and mold can form under the rubber gasket in the lid.