Just using a paper towel wont completely get all of the grease out. I take all the gears out and the o rigns and bearings, oil the bearings, clean the o rigns and DONT put them in any type of fluid as that will puff them up and not make a good seal. I put all the gears and case in V&M Namptha in a closed container and shake the bottle for 30 seconds. I use Mobil 1 synthetic grease to lube the o rings and use it anywhere dirt can get it, i.e. o rings, sun gear, etc. Then I use Losi black grease to coat the external gears, it just helps with longevity of the gears.