Is this corrosion worth worrying about?

KazooBR

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Doesn't seem like much but I don't know if this will spread. Do I fix it or leave it alone?
 

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No. It's just old surface corrosion. I assume there was a battery there.

It won't spread. And trying to clean it may make things worse. If it's working, just leave it.
 
well, that's the ground trace, and it's connected to everything. I had one of those (still do) years ago where it spread to the other side of the board far away from where the batteries were. lol

it may or may not get worse, but I don't take chances after seeing that one. the 74LS107 you can see has a little bit of green stuff on it. outgassing is the worst part.

I just use 100 grit sandpaper on that trace in the corner though.
 
You should leave PCB as it is, cleaning-resoldering can be done on the IC`s and affected terminals in the area.
If you really want a proper fix on that PCB, use chemicals to remove the soldering mask - i use DCM, applied after carefully masking surrounding area. I would not use sandpaper or any other tools to scratch it.
Then, the bare copper can be cleaned -i use chemicals again- and masked with soldering mask cured under UV.
Just my way to do it...
 
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