I have used Eucalan for years to wash sweaters, both hand knits and machine knits. I’ve even used it to rescue one that had been dry cleaned almost to extinction. This tip is new to me, though the literature I got when I first started using it said you could clean almost anything delicate. I must get some of the wipes to hand out to my clients.
I lovely woman from Oz once told me you can get it on the grocery store shelves in Australia & NZ but here you get it at good yarn shops.