Brake fluid is water soluble and therefore shouldn't mix well with lubricant anyway. It'll want to stay on the bottom of the case. I would do a simple drain/fill sequence. If it does bother you I'd probably dump maybe a couple of quarts of ATF (this flows easier than 80W or 90W) and try to rinse out any remaining fluid.
But on the whole, the 3 ox should bother anything seriously. I'd just do the drain and fill and that should cure your nerves. Then take 2 aspirins and call your local porn store in the morning.