I had some bad luck the other day and half way through my boil a small but significant amount of water fell in my brew from my extractor fan. I haven't given the extractor a good clean in a while and since I was in the boil stage I am not concerned about contamination, I am aware however there is probably a significant amount of grease up there that could have mixed with the water before dripping back into the kettle.
I finished up the batch anyway and its been fermenting happily a few days. What detrimental affects might be on the cards for my brew? a friend tells me fat certainly isn't a brewers friend.