I think if will depend on adhesive. I suspect it isn't water soluble or you would have already soaked it off. There are products that remove gummy adhesive by disolving it in a turpentine base, like Goof Off. You might try that but I wouldn't leave it on fabric for long. If you rub it off with an adhesive remover, throw it in the wash and wash it good. Sorry I'm not much help. Linda

It took me a month but I did call a glass company and the mirror is now gone! It was funny, I called around and got quotes for $200, $150, and $75. I asked the guy who would do it for $75 to come and do the job. I explained that it was 81 inches by 67 inches but I think his English was limited. He showed up today all alone! So he said, "That's too heavy for one person." and I thought he went to his truck to call in backup. He came back with his ladder and a suction cup and started to yank this huge 1/4 inch thick mirror off the wall. It popped right off with about 6 repositions of the suction cup. He asked if I wanted it in my garage. I said, "No, you're going to haul this away for me." He said, "No, I will cut it up and put it in the garbage." I was skeptical but I went with it. Then it was loose and he kept saying, "This is too heavy for one person. It weighs 300 pounds." So I watched as he cut the mirror into two pieces and lowered them to the floor. He cut those into long strips. Then he carried the strips outside where he found three trash cans on the cul-de-sac to spread the weight (it was trash day, yay!) and cut the strips into small pieces. The trash truck rolled by within the hour so my neighbors will never know that we borrowed their cans. There are some circles of mastic remaining on the wall, no big deal. The mirror was glued to the builder's original beige primer, so we know it was original to the house (1985). I have a painter coming in an hour to give me an estimate, I'm so glad it is not a huge mess for him. Thank you to everyone who weighed in on this project! I wanted to pick a paint color before I removed the mirror and that took me a month! We chose Benjamin Moore Concord Ivory- I can't wait until it's done!

This site is for woodworking, but glue is glue, right? It suggests heat and/or steam, so my suggestion is to try using your iron on the felt, using the hottest steam setting. Good luck! Here is a link that might be useful: Removing old glue

This isn't anything I've done before so I'm just guessing here so try at your own risk, lol! I might would try using a blow dryer or an iron to soften the adhesive and try to scratch it off. If trying the iron, I'd just hold the iron (with steam OFF since taffeta water marks) slightly above the fabric. Or use steam realizing that you may have to pay to have them cleaned after removing the glue. Also doing a google search I found where someone successfully used Carbona Stain Devils #1 Chewing Gum & Glue remover. Link: http://yedda.com/questions/remove_glue_5041516710947/ But once again, you may need to have them cleaned afterwards. I sometimes sew and don't use fabric glue or the iron on seam tape adhesives for the same reason you have run into...it removes flexibility to change/alter later. And yes, I'd think that a professional seamstress wouldn't use such time saving tactics. Maybe you can call your seamstress or a drapery/interior decorator business and ask them how to safely remove fabric glue. If you find a solution please let us know!