Your seals are probably beyond this little repair trick, but here it is anyways:
Use a piece of photography negative film to catch dirt lodged between fork tube and seal. The little square holes on the edges help catch thedirt when you move the film in a sawing motion up and down and around the fork tube. Clean off the film often. Cutting it into a thinner strip makes it easier to insert under the seal.
_________________
Ride to work: Pedal bike or 1986 Suzuki GS400S
Ride for fun: 2001 GasGas EC300 or my wife