how do i cancel the photo cleaner ap I got on Apple Apps?

There is an Apple article that explains how to cancel subscriptions. Click on the following link: If you want to cancel a subscription from Apple - Apple Support

If you subscribed using an in-app purchase, then go here:

If you want to cancel a subscription from Apple - Apple Support

It is not unusual for an app to direct you to their website to subscribe. This is done to prevent Apple from being able to manage the subscription and in that case you will need to cancel the subscription from the same website.