How do I cancel my Cleaner Kit free trial from the App Store?

Follow the steps in the support document linked below.

click here ➜ If you want to cancel a subscription from Apple - Apple Support

This is a user to user forum and Apple is not here. There is nothing we can do to help you. Contact the site to cancel your subscription. See if this helps: Subscriptions and Billing - Official Apple Support

You are addressing neither Apple nor the app developer here. This is a community of end users like you. We have no way to cancel anything on your behalf. See:

How to contact an app developer - Apple Support