GT85 is what I use. Spray the stations and leave for a few minutes. Pump the forks up and down to allow the lube to partially enter the dust seal. You will now see a nice thick rims of mud grit and crap. Clean that off and then respray and do the same. There should now be no marks being formed and then when you next use them you should get a light lube mark that you can clean off after the ride.
I do this every time I come in from a ride and have done it with all my forks.
Yeah 15 hours they say to take the lower legs off, clean, add new dust and foam seals, add 7ml or near that of oil and do back up.