Can Someone Help Me Identify a piece of Mail Art?

[Carmen Kennedy]

I received this intriguing piece of mail art from Spain, I think. I would like to respond if I can figure out where to send something. Many thanks.

[John Gayer]

That is from Pedro Bericat in Spain. I received a similar mailing with the same request for banknote-art. 

[Carmen Kennedy]

Tofu, I concur with you, and, besides, I wouldn't even know how to open it. It works perfectly on its own. Here's to Senor Clean....hahahaha.

[Tofu]

Pedro always sends these mystery pieces with undetermined material encased in plastic.  I always like them but would be terrified to actually open the plastic.  And now we know that Mr. Clean is called "Don Limpio" in Spain.

[Carmen Kennedy]

Thank you, Katerina. You have confirmed what a couple of other mail artists on FB suggested. Very, very gooey!

[Katerina Nikoltsou (MomKat)]

always gooey materials in plastic, whatever they may be:

[Katerina Nikoltsou (MomKat)]

It is from Spain...it is from Pedro Bericat: "Mute Sound".

Strange that he did not have his name and address sticker on it: