northernruth wrote:Sun will bleach them out once it's warm enough to hang out
Little Pants wrote:Try putting them in the freezer! Sounds gross, but wrap them in a bag first! Freezing can help to break stains down. After they have been frozen, try soaking in a strong sanitizing solution for a good 12 -24 hours, and then hang in the sun, or put on the window sill.
I'd say hang them out at night, but night frosts seem to have more or less finished, although we did have a couple last week!