What is the most "Thankless" job?

Street/Parking Lot Cleaners.

Every night, I clean up:

• Styrofoam cups/cans/plastic cups & bottles
• tossed out left over fast food
• dirty diapers that someone couldn't walk 7 feet through the Walmart parking lot to throw in an actual trash can
• empty boxes for: flat-screen TVs, Car seats, memory foam mattresses, or Amazon purchases
• disposable vapes
• trash bags that someone decided needed to be left in a parking lot instead of in a dumpster
• So. Many. Plastic. Hangers.
• receipts
• grocery bags
• candy wrappers
• Edit shattered glass, but it makes that gravel in a vacuum sound when the truck sucks it up, so that's nice.

And the only time I get thanked is when my employer asks me to do extra work because there was a storm, another driver was out sick, another driver needed help on a site, or there was a big event that needed to be cleaned for/after.