"What do you call a laundromat for…

A pig riddle is:

Q: What do you call a laundromat for pigs?
A: Hogwash.

The riddle has been cited in print since at least 2000.

2 April 2000, Toronto (ON) Star, “Funny Business” by Margot Griffin, pg. ?:
2. What do you call a laundromat for pigs?
(The Hogwash)

Google Groups: alt.support.thyroid
OT: Humor
Lois
Jun 11, 2005, 2:46:11 PM
(...)
2. What do you call a laundromat for pigs?
The Hogwash!

Google Groups: alt.support.thyroid
OT: Pigs in the news!
deT notsuH
Jan 24, 2007, 11:43:27 AM
(...)
Related joke of the day:
What do you call a laundromat for pigs?
The Hogwash!

Twitter
OOZyˎˊ˗ BLM)
@OOZwin
What do you call a laundromat for pigs?
- The Hogwash!
5:47 PM · Sep 17, 2011·Twitter Web Client

Twitter
Parking Pig
@ParkingPig
What do you call a laundromat for pigs?
A hogwash.
#ParkingPig #SwHalifax #startupweekend
2:22 AM · Mar 25, 2012·Twitter Web Client

Twitter
Pro Carpet
@ProCarpetATL
What do you call a laundromat for pigs? A HOGWASH! 😉 Have a great weekend.
2:20 AM · Oct 12, 2012·Hootsuite

Twitter
Dirty Nellys
@DirtyNellys
What do you call a laundromat for pigs? The Hogwash!
3:01 AM · Apr 25, 2013·Hootsuite

Twitter
Okla. Pork Council
@Okpork
Q: What do you call a laundromat for pigs?
A: Hogwash!
8:15 PM · Nov 22, 2013·Hootsuite

Twitter
Jimmy RevJim Olsen
@mybuddyjimmy
What do you call a laundromat for pigs? Hogwash. #LaughoftheDay
7:02 PM · Mar 25, 2021 from Des Moines, IA·Twitter for iPhone

“What do you call a laundromat for pigs?”/“Hogwash.”