I'm guessing it is water in the bottom of the tank now in your carbs. Try sucking some of the water, and gunk, out of the very bottom of the tank with a long clear hose. Also add a little fuel dryer (we have this stuff called HEET) to suspend the water until it gets used in the engine.
Also it is not a bad idea to intentionally use the reserve area of the tank. This helps cycle through any heavier, water laden gas that may be sitting in the bottom. Also it keeps the reserve circuit in the petcock clear in case you really need to use it some day.
Gasoline can absorb alot of water but too much settles out and obviously can cause problems. If your bike runs okay enough, just run another tank or two or three and the water in the carbs may clear out as the fresh gas that is cycled through absorbs the water in the bottom of the float bowls.
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