The ash is likely to be HIGHLY alkaline...wet ashes are known to be potentially corrosive for that reason. So watch the pH. Plus, grease tends to be fatty acids...so..
The skimmer socks may well save your filter. Skimmer socks are cheap and easy to replace.
I expect you'll need a lot of chlorine to break down the grease, so the more you can physically remove, the better, and it should float on the surface.. Obviously, you cannot use detergents.
While I'm sure it was very traumatic at the time, look at the bright side: You'll have GREAT stories for years!
Carl

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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.
