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Clear as like water? Your hubs should be filled with a heavy oil, I use 50/90 gear oil. You should maintain the oil level about half way up the hub.
To drain it pull the tire off (Grease your lug bolts while you're at it) and remove the 1/4' allen screw in the side of the hub.
I just take a big coffee can and some wire and hang the can under the hub and go have a cup of coffee as it takes a while for the oil to drain. Buy your gear oil in the bottle with the pointy end and it makes it easy to refill them.
When you replace that allen plug you'd best give it a good coating of never seize so it doesn't corrode in place.
If you have water in it that means your inside seals are gone and you need to pull the entire hub clean things up and replace the seals and the bearings.
Do both sides.
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