Sorry but I have not. However, I would be very very careful with bleach because you know what it does out of the bottle if you've ever splashed some onto a towel in the wash. With this silk screen you could ruin it because you have no experience with it, nor do you know what your neighbor has done, how vulnerable the inks were, the fabric etc. If you want to sell it, I would try to find out who did it and if their works is valuable or not. If it's just a fun project, knock yourself out and try stuff.
Looking at the photo, it looks like it's splotchy already and I don't know if it's discoloration or grime.
Also down at Home Depot where you can rent a carpet cleaning machine, they have an advisory notice that you're using it at your own risk and they're not responsible for the chemicals you use which can ruin a carpet if done wrong. So imprinted fabric cleaning is a known risk.
If there is a spot hidden by the frame, you could try a very little spot as a test. But it's risky no matter what you do -- my humble inexperienced guess. That's how they clean paintings at a museum.
I think there's probably a reason people don't talk about it on the internet which talks about everything. It may simply be a bad idea. The other thing is that if you want to keep it, you could reframe it under plexiglass (probably would cost a fair bit) and treat it like an antique photo would be from the civil war where discoloration is part of it at this point in time. But this is so modern in style that it may not match the era. I suppose how much you want to spend on it depends if your intention is to sell like on those TV shows or keep it.
If it's important to you I would ask at a museum or ask your question on sites that are focused on silk screen printing. Who knows. There may be a safe and easy way.
Or if you can find a signature you might look up the original artist and try contacting them directly with that question.
BTW, isn't that supposed to be hung vertically?
Last edited by D Akey; 12-10-2018 at 07:14 AM.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream