1.Method One: Lemon/White Vinegar Refreshing Method

Steps:

- Slice fresh lemon (2-3 slices suffice) or pour in a teaspoon of white vinegar.

- Fill the thermos with warm water (never boiling water, to prevent acid from reacting violently with metal).

- Secure the lid, shake vigorously, then let sit for 3-4 hours or overnight.

- Discard the solution, rinse thoroughly with clean water using a soft cloth.

2.Method 2: Baking Soda Absorption Method

Steps:

-Add one tablespoon of baking soda to the cup.

-Fill with warm water, then tightly secure the lid.

-Shake vigorously for several minutes, then let sit for 1-2 hours.

-Drain the solution and rinse thoroughly with clean water until no powder residue remains.

3.Method Three: Tea Leaf Deodorization

Steps:

-Place a handful of used wet tea leaves (dried leaves also work) into the cup.

-Pour in a small amount of hot water to cover the leaves.

-Cover the lid and gently shake to ensure the tea leaves contact every corner of the inner surface.

-Let sit for several hours, then discard the tea leaves and rinse thoroughly with clean water.

4.Method Four: Milk Soak Method

Steps:

-Pour warm milk (no need to boil) into the thermos, filling it about two-thirds full.

-Screw the lid on tightly and gently shake to ensure the milk contacts all inner surfaces.

-Let sit for 20-30 minutes.

-Pour out the milk, then thoroughly clean with water and dish soap to prevent milk residue from spoiling.

5.Method Five: Air-Drying Method

Steps:

-Disassemble all thermos components (lid, seal, tea strainer).

-Wash with dish soap, then dry with a clean soft cloth.

-Place the thermos body and all parts in a well-ventilated area (away from direct sunlight) to air-dry for 1-2 days. This will significantly reduce odors.