Elements left behind after deleting plugin

Hi

I started having browser errors, unable to load some autoptimize requests after my latest theme update.

I deactivate and deleted autoptimize and re tested.

Dareboost shows this message:-

0/100

Report an issue
2 resources are unreachable
You should avoid requesting unreachable resources.

Warning notifications that some requests related to your page are encountering errors can be due to:

errors in your HTML, CSS, or JavaScript resources;
an unhandled error on the server side;
or a problem with a service used by your page.
The following HTTP codes were returned:

404 (net::ERR_ABORTED):

https://www.mywebsite.co.uk/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=2.8.1

https://www.mywebsite.co.uk/wp-content/cache/autoptimize/js/autoptimize_cbf621551f8fe374b20a451a59e2e860.js

Can you please let me know how to remove whatever is requesting these urls ?

I cant find anything in functions.php

Thanks
Best regards

John