Paint thinner is a mineral cleaner. thus, it probably discolored/corroded/coated the pins. as for damage to the cpu, you'll have to plug it back into the socket to find out for sure. I would guess it should be ok. but I couldn't tell you for sure. though it will likely have a reduced connection to the mobo if it does work.
the best thing to use to clean a cpu aside from a thermal compound removing chemical such as 'Arctic Silver CPU cleaner', is a 99% alcohol solution, which you can typically get at a pharmacy on request. for your future cleaning needs
there is no 100% definitive way to know if your cpu works. I would put it back into the socket and see if it will boot. if you attempt to clean the cpu you can damage the pins, rendering it utterly useless. and soaking in in alcohol isn't wise. CPUs are very fragile and very sensitive to ESD static. handling them as little as possible is the best policy.
I don't know anything about paint thinner.
However, i know that sometimes, if necessary, the gold pads can be wiped cleaned with a soft lint free cloth and isopropyl alcohol (IPA).
All the best,
In general it is always recommended not to touch the cpu pins/contacts because of ESD. If something like thermal paste spread on the contacts then you may clean it very carefully with the material Rajiv stated. You should however be very careful while doing it.
If the cpu will still work, this I cannot guarantee. Only testing will prove it. But to my knowledge it should generally not be a big issue. Should work fine I assume, unless the thinner damaged the contacts from inside. The contacts changed colours because the thinner may have removed the protective layer from their surfaces, which then may have reduced the life span of the cpu.
Never use thinner to clean any electronic equipments.
everyone's all telling you the same thing
as for negative impact on the motherboard, I doubt it. but I re-iterate that there's no definitive answer. I admit that i'm completely taken by surprise that you used paint thinner, which is a high grade mineral-based solvent, to clean something so fragile. As Rooven and I both stated, it probably just discolored the metal and/or removed the protective coating on the contacts for the CPU.
it basically comes doew to this my friend:
-nothing is guarenteed, the only way to know is to put it into the motherboard and run it to test it.
-cleaning the pins/pads is inadvisable, due to them being very fragile and sensitive, but if you must, u can rinse them VERY CAREFULLY with 99% isopropyl/ethyl alcohol, then let it dry for a long time to be sure it's completely aired out.
-i can't see negative impact to the system board as being a problem here; but once again, there's no way to know for sure.