There have been several people who got motor oil and other products in their pool, but I've never heard of getting an entire grill into the water. The ash is something that has to be physically removed, probably through a combination of skimmer socks and circulation/filtration/backwash/clean. As for the organics, including grease, I'd suggest using an enzyme product such as Natural Chemistry® Pool First Aid™. If there's a LOT of oily substances on the surface of the water, then you can use absorbent mats from New Pig or AbsorbantsOnline.

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The ashes, as it has been said, can cause pH to go up so you might need to add some acid and physically filter them out. and the best way to get out the fat is skim off what you can and then use an enzyme as Chem Geek suggested. IF there is a problem woith persitant combined chloramnes possibly the use of a strong oxidizer like sodium percarbonate might be in order. If nothing else it can make any debris that has sunk to the bottom rise to the surface for easy skimming.
