To clean a sticky plastic surface, such as the handle of your umbrella, you can try the following methods:
Warm soapy water: Fill a basin or sink with warm water and add a few drops of mild dish soap. Dip a soft cloth or sponge into the soapy water and gently scrub the sticky plastic surface. Rinse the handle with clean water and dry it thoroughly.
Vinegar solution: Create a mixture of equal parts white vinegar and water. Dampen a cloth with the vinegar solution and rub it onto the sticky plastic surface. The acidity of vinegar helps break down the stickiness. After cleaning, rinse the handle with water and dry it completely.
Baking soda paste: Make a paste by mixing baking soda with a small amount of water. Apply the paste to the sticky plastic surface and gently scrub it using a soft cloth or sponge. The mild abrasive properties of baking soda can help remove sticky residue. Rinse the handle and dry it thoroughly.
Isopropyl alcohol: Moisten a cloth or cotton ball with isopropyl alcohol (also known as rubbing alcohol) and rub it onto the sticky plastic. Isopropyl alcohol is effective in removing sticky residue and evaporates quickly. After cleaning, rinse the handle with water and dry it completely.
Goo Gone or similar adhesive removers: You can use a commercial adhesive remover like Goo Gone. Apply a small amount to a cloth and gently rub it onto the sticky plastic. Follow the instructions provided by the specific product you are using. Rinse the handle with water and dry it thoroughly after cleaning.
Remember to test any cleaning method on a small, inconspicuous area of the plastic surface first to ensure it doesn't cause any damage or discoloration.