washing DMC crochet lace

i took down my Late mother`sLace [DMC ] curtain and shaked it well [ it hangs by a street window] than soaked it in luke warm water with hair shampoo , but it is still not clean , thus i made a nice soapy water with HAND soap ,,,, and let it soak all night it is much cleaner , but not IT yet ,,,,, i think i will rinse it well and now soak it in dishwashing fluids ... On the other hand decided to machine wash my Handwoven Cotton curtains after years of Hand washing them , any shrinkage that could happen probably already occured to them .... This curtains started as a Big sampler exploring how white and black couldbe combined in groups of 24 over 24 threads ,,,,,than i liked it`s mobility of colors so much i cut it into 3 nad turned into the Living room curtains. mirjam