Jon,
Did you check the baby department at Walmart? We bought a whole
bunch of cloth diapers last year at the local store for our bird (the
Cardinal).
I recall reading somewhere that one should not reuse the diapers
since laundering can not get rid of embedded particles, sand grains
etc. However, since we always wash the plexiglass with copious amount
of water using a chamois cloth to soak up the water and only use the
diapers for waxing (with Pledge), we launder and reuse them all the
time.

Hai Longworth