You can remove unused Docker images using the following command:
```
docker image prune -a
```
This will remove all images not referenced by any existing container. Note that you should be careful while using this command as it can potentially delete images that you intended to keep but are just currently not being used by any container.
Alternatively, if you want to remove a specific image, you can do it as follows:
1. Find out the ID or name of the image that you want to remove using the following command:
```
docker images
```
1. Copy the ID or name of the image you want to remove.
1. Use the following command to remove the specific image:
```
docker rmi
```
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