(little disclaimer, I didn't read whole comic for now! I'm reading it very rarely so sorry if some information are untrue!)

Oh, how long since poor Prime had a break? Million of years maybe , 'Sleep' for a hundred years on the earth don't count - his spark was restless even in this state...

Even after the war, after defeating Megatron - Prime trying to be busy , riding around the cities, checking for anyone who needs help, who just looks sad. Anything would help.

But one day very heavy rain started. Is it stopped Leader of Autobots? Of course Not.

He still gone for a ride , after hours he comes back - all dirty and wet.

You- the human that's stayed with the Autobots got shocked by the state Prime was in and wanted to help him.

Prime do not let you touch him for unknown reasons , maybe he fears that he'll hurt you? But anyway ,you lead him for a carwash instead of washing him yourself.

Right now Prime was sitting in the car wash in his robot form , his pedes pressed against his chasis , optics staring at one place without moving.

The brushes grind against his metal with unpleasant sound, but Prime seems to gone in his own world of suffering and self blame.