Actually...I just use a nappy kind of wash powder, and no prob's...
It's the coloured ones that give me grief,the colours run at times
:(
hence only white for me.
All my socks are plain black or navy blue. My old socks are grey and light blue, but that is only because they are washed out. I like my socks plain and simple so they go with anything.
I liked plain black socks until a few years ago when I discovered some Candy Crush socks!
I sent away to Europe for several pairs of these and gave some to friends who also play Candy Crush.
However I mostly buy expensive wool black or navy socks.