The only way to get it really clean is to take the tank off. They come off very easy. Take your seat off and you'll see how it's attached to the frame.
If its not very dirty you can usually use air to clean it out.
If it's really dirty take a stack of cloth rags run about six 1/4" X 1" long bolts with washers thru the rags to hold them together. Stuff the rags in the tank and shake the tank around. The bolts give the rags some wieght so they will get into all the corners. If the rags get soaked just pull them out ring them out and start over.
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