Marks on the PCB

[Askic]

Hello guys,
what would you say if you see marks on the PCB like the one shown in attached pictures?
Are those traces from liquid or something else?

Thank you!

[diif]

Re: Marks on the PCB

Crusty looking capacitors, green vias, looks like liquid to me.

[stj]

Re: Marks on the PCB

the green vias are solder-mask to protect the conductive paint.

the white could be a sign of moisture or just poor factory de-fluxing.

[Askic]

Re: Marks on the PCB

the green vias are solder-mask to protect the conductive paint.

the white could be a sign of moisture or just poor factory de-fluxing.

This board was in spare parts stock for about 10 years. It wasn't properly sealed but never used. I'm gonna use toothbrush and some isopropyl alcohol to clean it.