Sorry to rain on your parade but pretty much everything you did was the wrong way, let me explain: The reason you got corrosion in that area is because the barrel battery is leaking battery acid on to the motherboard, (they all do now at this age) this will keep eating all your traces away until they are gone and your board is then destroyed. first you have to remove that battery completely from the board, then you need to neutralize the acid and this is done with white vinegar 12-24% depending how much you got and I see it all over the board, Isopropyl alcohol will not clean this type of acid corrosion well. you begin with vinegar, let it fizzle until the corrosion and acid is gone but not too long as vinegar also cause corrosion if left on too long, then you clean the board with soapy water and a brush and let it dry, then you can touch up with ISO if you have removable residue left on the area, and Isopropanol and hydrogen peroxide is not the same thing at all btw, not even close. as it looks to me your board have gone pretty far in the battery damage and it is possible you have to do trace repairs for it to work properly over time. but make really sure you get that battery and acid off the board before it is completely too late. good luck mate
@@Windows_2001 yeah the batteries are extraordinary corrosive when they start to leak. It may not be obvious for everyone that they do this but I been along with this kind of stuff for a very long time now. Usually many replaces this battery with a lithium battery and either use a diode to block charging or disable that completely. The Barrel battery you see on boards like this are mostly rechargeable and get charge when the computer is turned on so you need to make sure a non rechargeable replacement don’t get charged by either using the diode or disable that on the board :)
