Yes, the "blue" in Blue Monday has faded, but it's still possible to see "red' on washday when "washable" clothing and lines don't prove so launderable. Here are some things to think about before you buy.
Pickett, Mary S.
"Is That "Washable" Fabric Really Washable?,"
Iowa Farm Science: Vol. 16
, Article 7.
Available at: https://lib.dr.iastate.edu/farmscience/vol16/iss5/7