How do you get your MCN's stain free in winter?

[LucaJack'sMum]

How do you get the stains out of your nappies in winter when you can't put them on the line in the sun????

I washed the last batch 3 times and had them in the window, but its just not the same????

[PinkPalace]

still put them out.
even on an overcast day the UV is still shining to whiten! just might take a couple of days rather and a few hours