"It is clean here."
Translation:Tutaj jest czysto.
Copying my comment from above, as I don't have a better explanation:
"No. It's a subjectless sentence, and I think even in English "it" is not in fact the subject. Maybe "here" could serve as a subject, I'm not sure.
"It is a clean fridge" would equal "This is a clean fridge" and mean "To jest czysta lodówka". But not here."