A silver flask makes a great gift, and is ideal for carrying around a drink. The small size of a flask makes it easy to stick in your pocket or purse. The small size also has disadvantages, one of which is cleaning. Cleaning a flask in important in keeping germs and bacteria from growing inside of the flask. The mouth of a flask is very narrow, making cleaning the inside of a flask challenging.
Empty the contents of the flask. Fill the flask with warm water and swirl it around. Discard the water from the flask.
Squeeze a drop of dish soap into the flask. Fill the flask ¾ full with hot water.
Secure the lid on the silver flask. Shake it up several times.
Unscrew the lid and discard the soapy water. Rinse out the flask several times with plain tap water to remove the soap residue. Continue rinsing until no more soap comes out of the flask.
Fill the flask with equal parts vinegar or lemon juice and hot water. Secure the lid tightly and shake up the flask several times. Allow the mixture to remain in the flask for about five minutes.
Place a clean rag into the sink. Empty the contents of the flask onto the rag.
Use the rag to wipe down the lid and rim of the flask. Wipe down the exterior of the flask as well.
Rinse the flask thoroughly with plain water. Rinse the lid in plain water as well.
Dry off the outside of the flask with a dry rag. Sit the flask on the counter to air dry for about one day. Leave the lid off of the flask while drying.
Shine up the outside of the flask with stainless steel cleaner. Spray a small amount of stainless steel cleaner onto a clean, dry rag. Wipe down the entire flask with the rag.