This is simple:
2.Rotary steel sweepers
(These 3 are on the same veihicle in most instances)
4.Snow throwers that remove the final "string/bank" of snow from the runway, and throws it aprox 2-300ft to the side.
5.Anti Ice treatment, called Urea/Freeway/Clearway
This works in the same way as salt on the highway, but is often nitrogene based. (You can't use salt due to corrotion on aircraft) (Not used if it's colder then 5 below freezing, it has no effect in low tempratures)
Sometimes you just use the sweper/blower, and lay Urea afterwards, but when you have heavy sowfall the whole system is used.
When you clear the runway on major airports something like 8 plough/sweep/blowers, 2 throwers, 2 Urea spreaders, and 2 friction test veihicles are at it at the same time. (Ex is from Stockholm/Arlanda airport)
And one final thing, how HUGE
would the "heating" bill be if they had to heat the whole runway?