If it were mine I'd clean the lens with everything I had layin around. I'd coat it with nose oil then noxema then clean with lens solution and sit it out in the sun for few days
If that didn't work I'd break out the simichrome polish and do my best -most even- polishing with clean q-tips
Might work
Might not
If it's a junker lens that cannot be fixed for a sane amount of $ nothing to lose
after the polish do all nose oil, noxema, solution etc again