Removing mascara, especially a waterproof one like brown mascara, can be a bit tricky. However, it's essential to do it gently to avoid damaging your lashes. Here are some tips:

1. Use Oil-Based Remover: An oil-based makeup remover is effective in breaking down the waterproof mascara. Apply a small amount of the remover on a cotton pad and gently press it against your lashes. Hold it there for a few seconds to allow the oil to dissolve the mascara, then gently wipe it off.

2. Micellar Water: Micellar water is a gentle yet effective option for removing mascara. It contains tiny micelles (small clusters of fatty acid esters) that act like magnets to lift dirt, oil, and makeup from the skin. Soak a cotton pad in micellar water and gently press it against your lashes for a few seconds before wiping off the mascara.

3. Use a Gentle Cleanser: If you don't have a makeup remover, a gentle facial cleanser can work. Apply the cleanser to your lashes and gently massage it in with your fingertips. Rinse with warm water.

4. Avoid Rubbing: Rubbing can cause your lashes to break or fall out. Instead, use a gentle sweeping motion from the base of your lashes to the tip.

5. Hydrate Your Lashes: After removing mascara, it's essential to hydrate your lashes. You can use a lash serum or a natural oil like castor or almond oil. This will help keep your lashes healthy and prevent them from drying out.

Remember, the key to removing mascara without damaging your lashes is to be gentle and patient. Don't rush the process, and make sure to nourish your lashes afterward.