Fix rust on front wheel How do I fix and prevent this rust on the front wheel?
The rust shown is purely cosmetic.
Rust removal / Cleaning needs to be done with care. Even with the rubber seal, theres a chance of getting contamination into the bearings.  I would use a small wire brush and gently take the worst of off, then spray the surfaces with WD40, a silicon spray or other water repealant/lube spray. Not too much as you don't want it in the bearings. Oil or grease can also be used but be careful not to leave too much on - apply and wipe with cloth to remove excess.
If the bike is stored outside or in a damp location you may want give the metal surfaces a quick squirt regularly- especially after washing the bike.