Hey Dave, there's an easy way of doing this. Drill a small (2-2.5mm) hole in the hub between the place each bearing sits (strip the hubs and do some careful measuring) and you can blast the water and muck out in situ as shown. Afterwards you can plug the hole with short pieces of a rubber band or just an M3 grub screw if the hub is plastic.
It doesn't weaken the hubs, Mugen did this with the MBX6 but i've done this for a long time with lots of different cars.
TBH I still strip and service my hubs every week, this isn't a good enough system to never have to take the hubs apart, but it does mean you can quickly disperse the water and crud when you get home tired after a day's racing and do the job properly later in the week when you feel like it
I once raced my DEX210 in the wet and did this when I got home, then didn't touch the car for 6 months and the bearings were still fine, but if you don't do anything with them they'll rust within a couple of hours. If they feel crunchy it's already too late.
