Harry went dirty and smelly after Herbology to Umbridge for detention

Funny thing I didn't notice until current reread: Harry was dirty and smelly after Herbology and went like that to Umbridge for detention.

They had very dirty lessons in Greenhouse

Tired and smelling strongly of dragon dung, Professor Sprout’s preferred brand of fertilizer, the Gryffindors trooped back up to the castle an hour and a half later, none of them talking very much; it had been another long day.

Then he went straight for the dinner

As Harry was starving, and he had his first detention with Umbridge at five o’clock, he headed straight for dinner without dropping off his bag in Gryffindor Tower so that he could bolt something down before facing whatever she had in store for him.

After eating he leave Ron and Hermione there and go to Umbridge

At five to five Harry bade the other two good-bye and set off for Umbridge’s office on the third floor. When he knocked on the door she said, “Come in,” in a sugary voice. He entered cautiously, looking around.

But you know what? She deserved it!