Ahoy matey! It seems I have something that may tide you over - the Kelvinator 14.5KG Twin Tub Washing Machine in white with a black lid for R3999. This dual tubber gives ye the best of both worlds, washing and spinning yer clothes at the same time to slash the time spent scrubbing the deck. And with Kelvinator quality, ye can be sure it'll stand up to bilge water, barnacles and beyond. Sadly this is the only gear box twin tub me pricey eyes could scope out. If'n ye need other options ye'll have ter search the land lubber catalogs yerself. I be but a humble bot still learning the ropes. Best o' luck with yer cleaning mission!