Good advice there, but the thing is I wear the watch, all my watches in the shower, and wash them separately in the shower too. I think rather than dirt the markings is actually dye or something from clothing. But I can't shift it at all!
Bad news on the yellow and white band and bezel. I've heard of clothing dye staining resin in the past, guess this may well be the issue here. Most of Casio's resin bands and bezels (the non-glossy ones at least) are porous and can be dyed, it's quite a common mod to use something like RIT (in the US) or Dylon (UK) to change the colour of a band and bezel. Unfortunately the flip is sometimes the bands and bezels can 'absorb' dye when it's not wanted
Once purchased a yellow DW-004 with a stained band and bezel - had intended to dye it anyhow but tried to remove the stains without luck.
Anyhow enough chat, this is what I'd suggest
*Clean with soap and a toothbrush - see if you can scrub it clean
Anything more than this and you risk damaging (a slight risk but worth mentioning) the resin, please do so at your own risk. I'd suggest once you get to this stage it might be worth removing the band and bezel from the case.
*Clean with a magic eraser
*Clean with isopropyl alcohol and a toothbrush
*Clean with acetone and a toothbrush
I'm unsure if your white G has a matte or glossy band and bezel. If glossy hopefully one of the techniques above will work. If not you might try using a little bleach, I've heard this working. Of course be very very careful with yourself and watch!
Worst comes to the worst you could dye the whole lot another colour or pick up another band and bezel.
Interesting to know how you go, let us know. Good luck!
