This is written on an ad card:
Dirty Laundry, a fresh spin on laundry day.
Explain, please, the meaning of it.
The capitalization of "Dirty Laundry" suggests that this is an advertisement for a movie, TV show, play, or book. IMdb shows that there are two recent TV shows around the world with this title: one from 2016, another from 2017, so I suspect it's an ad for one of them (or maybe something I didn't find).
The later reference to "laundry day" implies that the story involves people doing laundry.
As stated in the other answer, "fresh spin" is an idiom meaning a new, interesting way of looking at something.
Taken as a whole, this is saying that this TV show is about interesting, probably unexpected, things happening at a laundry.
It also makes use of two puns: cleaning laundry makes it fresh, and washing machines have a spin cycle. Puns are very popular in slogans.
This expression is full of double entendres.
Let me explain the individual meanings:
"Dirty laundry" - An expression that could mean literally dirty clothes that must be washed. It could also mean something you don't wish to do, aka, "I helped you once already with your homework, but don't expect me to take care of your dirty laundry again."
"A fresh spin" - An expression that could mean literally a "refreshing spin" which brings to mind the spin of a washing machine used to clean clothes. "A fresh spin" is also an expression that means "a new take" on something. "Rotisserie chicken offered in grocery stores offers a fresh spin on cooked chicken."
Put these meanings together, and you can take it to mean "Dirty Laundry is a new way to think about doing laundry." The expression "Dirty Laundry" fits the theme as the general theme is about laundry. "A fresh spin" fits as well, as in a real sense it is a literal "fresh spin" in how laundry is cleaned.