I've stuck a few sets through the washing mashine and thay came out mint!

word of warning tho...

don't put them on a high heat,

wash the base bolsters and headrest in one wash and the back bolsters in two seperate washes, theres a big j clip on the bottom of the cover that could rip other covers

the material has a foam laminated to it, if the foams coming away from the material i would'nt stick them through the wash there be nothing left of the foam

or by washing them the foam will come away from the material

never had any proplems myself but i've heard a few bad stories