There’s some stuff called Curtain Magic, it’s from New Zealand but you’ll find it on Amazon. It’s quite expensive because it is sent by the seller from NZ, but if you think the tent is worth it then I’d recommend it. We used it on net and main curtains that were green and black and it got rid of the mould in minutes. Thing is, the mould is happily dissolving the canvas of your tent, so vinegar is a good option. It might not remove the visual aspect, but it should have killed the mould. Curtains, well, they’re not exactly structural like your canvas so weakening them with a bleaching solution doesn’t really matter.
You’ll have to do a tie dye tent.
Oh, and if you get over on ROF, and still have the upside down biltong knife that I gently sliced into my thumb at Bardsters that time, then I will load the box and send spicy dried meat your way.