My preferred view is that the first thing you want to do is starve it of fuel - in other words fuel OFF, throttle FULL - to burn all the fuel out of the lines.
Interesting. I'd always been taught 'everything OFF', but after reading your comment above, I guess I'd end up with an amount (albeit small?) of unburnt fuel in the system somewhere. I hadn't ever thought about that.
God forbid I should ever have the need to follow that piece of your advice Ghenghis, but thankyou for sharing it!
I agree with the sideslip and getting down asap, but also remember (if you're not absolutely bricking it at that point - I'm sure I would be!) to close all the cabin air vents to help stop smoke getting in while you're descending.
Hmm, leads me to another question though - on forced landings I was taught to unlatch the door prior to landing, in case the landing was heavy, the frame was damaged, and the door couldn't be opened. I'm talking PA28 here, so only single door. What would be the drill for a forced landing due to fire? Would unlatching on the way down lead to a cabin full of smoke, or would the aeroplane's velocity and attitude and the position of the door manage to overcome that hazard?