Being modern art, there are probably some fans who believe its value has just shot up through the roof.
They may think the removal of the stain is an allegory for the modern social upheavals mirroring the struggle of the working class fight against social convention. Where even a humble cleaner has the potential to "remove an unsightly stain" and overturn everything.
Seriously, modern art seems so pointless to me, and I often feel that some people like to read anything they can into it to try and justify it. I wouldn't be surprised if someone has actually thought what I just posted. Maybe I just plain don't understand it.







