washless

adjective3

1. •
   Without a wash, or an act of washing.

   • Seventy soapless, washless days. — 1918
2. •
   That does not involve washing.
3. •
   That does not need to be washed.

   • There are now washless dishes, painless razors, painless shoes, painless corsets, prepared soups, painless photographs (it used to give you a stiff neck for three days to have your picture taken)[…] — 1924