Some airplane flight manuals specify a higher approach speed - in the order of 10 knots added to the additive for wind gusts etc when in moderate to heavy ice or with ice on the airframe. Also it may advise to add 10 knots to all holding and approach speeds, up to the flap limit speed for any flap setting.
Some manuals may recommend less landing flap. This may be to reduce the risk of the tailplane stalling, i.e. the less pitch down tendency the tail has to counter the better for all who find themselves in such an unenviable situation.
While it is all very well to say you shouldn't be there in the first place, fact is if you fly in certain parts of the world you will go there sometime and may not have the fuel to go somewhere better.