dirty vent

I just got 2 new budgies around 3 days ago. According to their previous owner they were on an all-seed diet ( specifically canary seed). So on the day I first got them . I noticed that Sugar, the dilute violet budgie had some feces( quite dark colored and dried up) being stucked on his vent ...

Hi all! Holly has had staining around her vent for a long time at my parents (she is Almost 2 years old) At first we thought it was from her pooping in this little sleeping tent we got her a year ago and we removed it - it got better but she still has this staining going on for several months...