read the slogan.
the window cleaner that makes glass invisible again.
which technique does the writer use to make the slogan memorable?
alliteration
a pithy slogan
word play

The answer is: A pithy slogan.

Explanation:

Let's discard the other options first...

We have: alliteration, and in this slogan it is not used this technique as this term refers to sames sounds or same consonants at the beginning of each word -this is not the case. A word play is mostly known for creating contradictions and/or redundancies -again, this is not the case. And finally a pithy phrase or slogan accordind to this context, means to give a brief but full of meaning phrase, needless to include so many words to let your audience know what you exactly mean, which here, it is the case:

What else could we add? Nothing as it is clear that if you use that product, your windows will be super clean!

introduce and provide context for each quotation

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