Hello guys
Any advice on how to clean up this board? It is still functioning correctly but I think it is just a matter of time before I will get problems
Thanks

 

There are lots of article on "creep corrosion." It affects mostly lead-free boards.

https://www.dfrsolutions.com/hubfs/...lead-free_pcb_in_high_sulfur_environments.pdf

You might search for how to clean creep corrosion. There might be some new, specific cleaners available.