Will soapy water kill my turtle?

I have a Red Eared Slider and I washed his tank with soap earlier today (BIG mistake) and I couldn't get all of it to rinse out. The water looks clear and there aren't any bubbles or anything, but I can see a little bit of soap residue floating on top of the water, and no matter how much I skim the top of the water off, it's still there. My turtle seems okay so far. No puffy eyes, and he's eating just fine. He's been in there for about two hours. I have a filter. He is blowing bubbles out of his nose, but only when he's under water. He also hasn't done any basking since I put him in there, but it is a new tank so that could be part of the problem. I don't know if that's something to worry about or if I'm just being paranoid.