There are multiple ways to remove product data from your Merchant Center account. It's also important to remember that all products expire from your Merchant Center account after 30 days if the product data does not get updated within that timespan.
Remove the item from your product data feed: If you're updating your products via a data feed, simply delete the product(s) from your file and submit the feed again.
expiration_date [expiration_date] attribute: Add an
expiration_date [expiration_date] to any items that you would like to remove on a specific date. Learn more about using this attribute in the product data specification
Bear in mind:
There can be a delay of 24–48 hours when an item can still be served live in Shopping results once it has been removed or excluded.