What do de-icers do during summer? I was reading about plane de-icing the other day, and someone posted a comment saying that was their job, and when no planes needed de-icing they just slept/waited in the de-icing truck.

I was looking just now at de-icing jobs, and found one at heathrow that said it was a permanent 40-hour/week job.

So what do they actually do during summer? Do they do a different job or do they just wait in case a random (unlikely) snow storm passes by?
Most de-icers are run by the airport FBO so the people who work on de-icing in the winter work on other FBO duties such as refueling and the like when there is no de-icing to do. Some de-icers are just hired permanently for winter times.