Removes all Amazon saved for later items on the cart page. It will only remove visible items. You might want to scroll first to make more items visible. To use paste code in developer console (Ctrl+Shift+J or Cmd+Opt+J in Chrome) then press enter.

deleteAmazonSavedItems.js

function deleteSavedItems() {
	var query = document.querySelectorAll("#sc-saved-cart input[value=Delete]")
	if (query.length) {
		query[0].click();
	}
	if (query.length > 1) {
		setTimeout(deleteSavedItems,100);
	}
	else {
		console.log('Finished');
	}
}
deleteSavedItems();

Sir, thank you for this quick script! I personally had to modify it for it to work for me. I use chrome and it would just stop after a couple of items. Since I had over 500, I rewrote it to continue or wait to load more. Sharing in case it helps anyone else. :D

function deleteSavedItems() {
	/*
	* This variable finds the delete option from saved items
	*/
	var query = document.querySelectorAll('#sc-saved-cart input[value=Delete]')
	/*
	* This variable finds the amount of saved items you have
	*/
	var savedItems = document.getElementById('sc-saved-cart-list-caption-text').getAttribute('data-saved-item-quantity');
	
	//Loop until finished
	while(savedItems > 0) {
	//Check that our saved items hasn't reached zero index yet
	if (savedItems.length > 0) {
		//Check that there is a delete option for items
		if(query.length) {
			query[0].click();
		}
		//The list isn't zero but no delete option was found, so wait for the page to refresh more saved items
		else if (!query.length) {
		setTimeout(deleteSavedItems, 200);
		}
	}
	//Quickly delete the items that are present
	if (query.length > 1) {
		setTimeout(deleteSavedItems,35);
	}
	savedItems--;
	}
}
deleteSavedItems();

Confirming this still works as of October 15th, 2023. Thank you for this. This was a life saver. Stupid ex-wife had saved over 600 items.

I get "undefined" , Why?

I've modified this to work in 2024:

function deleteSavedItems() {
    var elements = document.querySelectorAll("input[name^='submit.delete.']");

    if (elements.length > 0) {
        elements.forEach(function(element) {
            element.click();
        });
        setTimeout(deleteSavedItems, 100);
    } else {
        console.log('Finished');
    }
}

deleteSavedItems();

Should you desire to move your items to a Wish List instead of deleting them for good, you can do so with a slight extension to the great script already provided by @MichaelLawton. You'll need to view the source of your Shopping Cart page to get the list/registry ID of your specific list to save them to (should look something like "#registry-XXXXXXXXXXXXX").

function moveToWishList() {
	var query = document.querySelectorAll("#sc-saved-cart input[value='Move to Wish List']")
	if (query.length) {
		query[0].click();
	}
	var query2 = document.querySelectorAll("#registry-XXXXXXXXXXXXX a")
	if (query2.length) {
		query2[0].click();
	}
	if (query.length > 1) {
		setTimeout(moveToWishList,5000);
	}
	else {
		console.log('Finished');
	}
}
moveToWishList();

THANK YOU!! @PeterSchuebel , @MichaelLawton and @kyletmiller

Can we do/ add a similar script (direct or via Grease Monkey etc) or via an Extension to do this WishList action(s)?

https://webapps.stackexchange.com/questions/118938/amazon-wishlists-select-and-move-multiple-items-at-same-time-from-one-default

Amazon Wishlists: Select and Move multiple items at same time from One/ Default Wishlist to others?

Have collected a lot of items on Default Wishlist and would like to MOVE and organize them.

As shown below, one has to select each item one at time from a Default Wishlist to MOVE it to other ones to Organize them.

I was hoping there was some way to select multiple and have them MOVE together to another list - many at one go; I am guessing some kind "multi select" using Checkmarks or something else.

Thoughts & ideas welcome.

https://i.stack.imgur.com/JSJVt.png