Artistic liberties. Bulma would have a drier.

Maybe she likes air dryed linens?

not every thing can be put in the drier, shes filthy stinkin rich perhaps all her stuff is really high quality... maybe she has silk sheets and maybe his suit is made of some unique... fabric?

Shes rich, but shes also smart. She would have invented something to dry any fabric.

Look at that Vegeta stain

Burasi said:

not every thing can be put in the drier, shes filthy stinkin rich perhaps all her stuff is really high quality... maybe she has silk sheets and maybe his suit is made of some unique... fabric?

"Fine, but be careful, those are dry-clean only!"
http://youtu.be/mxSRmLBuL4k?t=2m3s

Pixiv URL: pixiv #43920493/p24 (750 x 750 px)