This is a "what to do with the dregs" post.
The ketchup was treated the same way: dregs added to a new, awaiting bottle but this time, I added just a bit of water to the bottle, again capped it and shook it clean. You can see the "tomato water" above. I added this tomato water to my CP of taco soup. The now empty ketchup bottle was rinsed through, using the soapy water that has been in my dishbin all morning. It is now recycled.
While I tend to pay little for condiments, relying heavily upon store sales and ideally, a coupon stacked on top of it, or a Dollar Tree purchase, I avoid food waste where ever I can. I won't become wealthy overnight this way, but saving pennies here and there really does add up!