Deleting services

While there isn't a single "one-click" solution to remove all resources at once, there are a few approaches you can take to efficiently clean up your AWS account:

1. Use the AWS Tag Editor: This tool allows you to search for resources across multiple services and regions. You can use it to identify and then delete resources in bulk.

2. Check each service console: For the specific services you mentioned (EC2, S3, KMS), you can go to their respective consoles and delete resources there.

3. AWS CLI or SDK: If you're comfortable with programming, you can use AWS CLI or SDKs to script the deletion of resources across services.

4. Consider AWS Nuke: This is a third-party tool designed to delete all resources in an AWS account. However, use it with extreme caution as it can delete everything, including important data.

5. Review your bill: Sometimes, services like Data Transfer don't have specific resources to delete but are a result of other services' usage.

Remember, even if you don't see active resources, some services might still appear on your bill due to previous usage or because they don't have traditional "resources" to delete.

If you're planning to stop using AWS altogether, you might consider closing your account, which would effectively terminate all services and prevent future charges. However, be sure to back up any data you want to keep before doing this.

Always double-check your actions when deleting resources to avoid accidentally removing something important.
Sources
unexpected, never used active services showing up in 'Charges by Service' under Bills section in 'Billing & Cost Mgmt' dashboard. | AWS re:Post
Closing All Resources | AWS re:Post
Cost Management | AWS re:Post