We have had our Kantha pillows for four years and they are so soft and wonderful that our cats use them as beds! Over time, the fabric seemed to have lost some of its bright colour and the fabric seemed less stiff than when they were new.
We took the cases off the filler and hand-washed them in tepid water and soap. Leaving them to dry, it was amazing how the colours were as bright as when they were brand new.
Using spray starch, we ironed them and now they look brand new.