Possible? I don't know. If it requires recoating I think you'd be better off avoiding situations that produce flare and get a good lens shade. OTOH, if it residual cleaning material and it needs some sort of disassembly, recleaning and polishing, you could try these guys at Midwest Camera. They give online estimates that are pretty reasonable.
Also, since you're in NYC, NY Lens and Repro merged with Calumet. NYLR always did great repair work and since they're in with Calumet now, take a ride down there and ask them to take a look. Calumet Photographic at 22 W 22 Street, NYC. It might be worth having them check it out.