My new car has a button that reads "Rear Wiper"!

[magicarpet]

12. Oh,... you must have one of thems super duper Denali versions with all the bells and whistle

... with all the automotive options known to man.

What you have there is the brand new option that just came out,... it is called the "Rear Wiper" to be somewhat diplomatic. Actually what you have is that new fangled "Automotive Bidette" which originated in France.

It should be built right into the driver's seat. If you should mess yourself or have an adult diaper accident. No need to pull over to visit a restroom to tidy up. Just flip the switch,... six nozzles pop up and rinses your private parts. You don't have to pull over or anything. Warm water is squirted on your junk as you continue driving down the highway doing 90 mph.

Hence the name of the option "Rear (End) Wiper".

Glad I could help in your understandings and save you from all that confusion.

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The following sourced from Artificial Intelligence (AI).

A bidet is a plumbing fixture that sprays water to clean the genital and anal areas after using the toilet:
Bidets can be standalone units, attachments, or handheld devices. They can be attached to the side of the toilet bowl, or integrated into the toilet seat or car seat itself as a bidet toilet. Some bidets have a detachable hose.