[EC250]

Hi so my bikes 15years old and the spokes & nipples are a bit rusty, when should I replace them, do I even need to ? , I got quoted ?400 to renew/ spay the wheels and change the nipples & spokes and have the centres coloured any colour i wanted, I understand there's a fair bit work involved in doing all this,
But if I can get away with just giving them a clean up that would be great.

Cheers for any help