1. Use wine: The pattern material on the umbrella is generally soluble in wine, just wipe the pattern with a cotton piece dipped in wine.

2. Use essential balm: peppermint oil in essential balm has similar compatibility with oil-soluble raw materials and can be dissolved.

3. Use gasoline: Gasoline is a very good solvent, which can dissolve all colorful patterns on umbrellas.

4. Use white vinegar: pour half a cup of 40-degree warm water, and then dip a towel in the vertical direction of the umbrella stand, in the same direction. Clean and dry.

It should be noted that these methods may have an impact on the material of umbrellas, so it is recommended to try them in a small scale first to ensure satisfactory results before fully using them.