This is one of my few posts that is not a wind up.
I use Johnson's baby oil in mine. I read it on a motoX web site and have been using it ever since.
We had tonnes of it from when the kids were small. Dont have enough imagination to use it in our sex life. So now I just let the leak from my slave cylinder drip down the sidestand and top up the baby oil now and then.
I take a bottle to the track with me also, in case I get lucky with a brolly dolly. If I dont I can always drink it