TF recommend any lube with Teflon. Some chain lubes have that. Just to be "perfect" I use proper Sendtec fork oil that I drip onto the seals with a neat little "Pen oiler". I let it soak in and just before the ride compress the fork a few times and wipe the stanchions with a rag to remove dirt trapped under the seals.
These precision oilers can be bought at car accesory stores for just a few quid and make adding a couple of drops of oil very easy. If you do that every ride it makes a big difference to performance and extends service interval.