I did some research on the product, and you are right. It is 100% fish oil, which I assume has a terrible smell if it?s anything like the cod liver oil my Mother used to give me.
I could not tell from the manufacturer if this was a supplement you put in food, or if it intended to be used topically on your dogs which is why the oil is around your sink. Fish oil is good for human too, and maybe the product works well on the outside as well as the inside of your dog..
Once fish oil is exposed to oxygen, it begins to go rancid, and it only takes a few molecules for our nose to sense it.
The good news is we can most likely take care of the nasty smell, and with all natural products too.
First get a bucket with a gallon of warm water and put in about 1/2 cup of laundry detergent or dish washing liquid. With a clean rag, scrub down the entire area thoroughly making sure not to miss any cracks or crevasses. Use a clean dry cotton towel and dry the area to absorb any remaining wetness, which will also pick up any oil that had broken down in the detergent that is still on the countertops.
After the area is dry, wet a clean rag with a 50/50 mixture of plain white vinegar and water. Vinegar is slightly acidic and is a great natural deodorizer, anti-bacterial, and anti-fungal. The vinegar smell dissipates quickly and it will help neutralize the fish oil smell. Let the liquid sit for about 15 minutes, (rewipe the area if needed) then wipe it dry. There is no need to rinse it off, as it is not harmful and it kills germs too.
If any smell remains the next day, you can try the plain white vinegar at 3/4 strength with 1/4 water, and also add 3/4 cup of baking soda for a more powerful punch. Baking soda is a very good deodorizer, but it also is slightly abrasive, so make sure not to scrub, as it could scratch the surface you are cleaning. Again let the solution sit for about 15 minutes, but this time you need to rinse it off as the baking soda will leave a white residue when it dries. (It?s not harmful, but it should be removed as it makes a mess)
This should do the trick, if by some chance you still smell the fish oil, (if it is in the cracks and crevasses), I?d fill a spray bottle with full strength white vinegar and periodically spray the area. The fish oil won?t stand a chance!