"fsck -y /" keeps saying "Disk is still dirty" no matter how many times I run it

[Yuri]

As a result of the power outage I needed to run fsck on UFS disk with 
soft-updates.

But every time the command 'fsck -y /' says that it corrected a lot of 
problems, but it still leaves the disk dirty. I ran it at least 15 times 
- same result.

What would be the way to proceed from here?

(I ran fsck before, but it never happened that fsck keeps finding problems)

Thank you,
Yuri