The other day, I managed somehow to drop thermal paste (arctic mx 4) on 6 pin pads. I used dry towel to clean it gently, but pads are still bit darker. Got scared to use alcohol. The thing is the cpu isn't mine and I was asked to put thermal paste by a friend because his motherboard died and ordered another one. Do you think I damaged it? I do not know what to do. Is the discoloration an issue you think?