Recently purchased a new to me K5, barely used maybe less than 200 shots on it. Everything was good till I decided to shoot with high f-stops to see if the sensor was dirty. Had some dirt on it but nothing crazy, nonetheless I gave it a wet cleaning. That took everything off except for this one annoying spot. I know that the K5s were notorious for sensor stains but I am not sure if that is what this is. Could just be a really stubborn spot, but I believe I have worked it enough to know its probably not coming off. Any opinions would be greatly appreciated, I would hate to send it in as a repair would probably cost close to what I paid for it. Thanks.
The spot is slightly off center to the right and down. It shows up at f11 and if you are trying hard to spot it can be seen at 5.6.
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