GT85, TF2, it’s just thin cable lube. WD40 is paintwork shiner at best and no good for anything else on a bike imo.
If the fork’s not lubricating itself, it needs a service. Keeping the seal area clean and cycling the fork upside down should do it for simple routine wiper lubrication. Or, but some specific spray / lube from someone that knows what they’re on about, Loco, Mojo, Stendec, TF Tuned etc.
I used to drip a bit of fork oil between seal and stanchion on my old bombers then cycle the fork, it lifted some dirt out but then realised I was probably washing just as much grit in. Save your time and spend it on more regular oil changes.
But don’t listen to me, I got so bored of sus fork faffery I got some rigid forks.