I think the picture speaks a thousand words:
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More samples and using indirect clamp would help. Start with a value of around 10 and work down unti your happy with the results. – Timaroberts Apr 10 '16 at 13:37
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http://blender.stackexchange.com/questions/4980/how-to-avoid-noisy-renders-in-cycles – Apr 10 '16 at 16:36
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meybe related: http://blender.stackexchange.com/questions/42908/cycles-render-noisy-even-when-using-a-high-number-of-samples/42947#42947 – Apr 10 '16 at 16:38
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I think words are better when we don't know much else about your project... or post a thousand images worth of settings for your scene. But If you want a single worthwhile answer please upload a file so others can help you find the problem... you an use http://blend-exchange.giantcowfilms.com/help/ – Apr 11 '16 at 23:32