Since we have been a user with Cal Cover Duster for 20 years and have the following comments....
1, For maintenance, here is direct lift from Cal Cover staff...
"You really do not want to try and clean or rinse the California Car Duster until it is a last resort.
For daily maintenance, simply shake out the car duster or clean it thoroughly with an air gun. The mop will discolor with continued use, but keep using the car duster as long as it is picking up the dust..."
2. Regarding availability
They have (2) versions (1) with a wooden handle $24.95, and (1) with a plastic handle $19.95. They also have a couple of smaller versions available as well..

Just my $0.02... wink