Repairing drawer - how to best remove previous glue

[OM2]

I have a wooden drawer that has had the back part come off.
In the past I have repaired many times (over say 10 years!!).
There is a lot of glue remaining.
Should I just file down and make smooth - keeping some of the glue?

I thought I'd ask before getting the sander out!

Thanks.

 

[foxhole]

Sharp knife then sand

 

[^woody^]

Use a different repair method to all the others you have done over 10 years!