Yeah, I never washed it with anything else either. And it seems that the bristles would get all gnarlied up in a cotton sock...BTW, the bore snakes can be placed inside an old sock and tossed in the washing machine along with a load of laundry.
I do not wish to wash my cloths along with lead salt contaminated articles.
I just filled a Mason jar with hot soapy water, dropped in the snake and shook the crap out of it (literally).
Rinse it til it runs clear and toss it over a shower rod overnight.
Edit:I have read reviews that the plastic end comes off the cord rather easily. Have you used a PatchWorm for very long?
OHhhh..."PatchWorm"..I thought you were asking about the end of a BoreSnake (until I re-read).
Yeah, I've used the same PatchWorm for about 8 years now. I keep buying others as back ups in case it breaks some day, but somehow I end up giving them away all the time.