To remove the adhesive left on the label on the plastic bottle, you need to prepare: cotton swabs and alcohol. The specific removal method is as follows:

1. First prepare a bottle of alcohol as shown in the picture stand-by.

2. Next, take out the cotton swab and dip it in alcohol as shown in the picture below.

3. Then use a cotton swab soaked in alcohol to wipe the adhesive left on the label on the plastic bottle as shown in the picture below. The alcohol can dissolve the adhesive.

4. Finally, the label adhesive on the plastic bottle was removed.