Not an old hand so would not know mate. Did see a few who would scrap the paint of the portholes and polish them up and they did look great but not many did it and probably would have had a quick lick of paint when the next occupant took over the cabin LOL. On watch during daylight hours would see us polishing and touching up the varnish on the bridge and such like.
That's the way the mop flops.
My thanks to Brian for this site.