I don't use the stuff but you got me curious. You should tell your quilter because it could damage the machine.
Here's the link where I found that info:
https://www.jandofabrics.com/blog/he...ps-and-tricks/
Here are that website's tips. Ignoring some or all of these may help get rid of the bonding agent.
Pre-wash all clothing and fabrics before using Heat N’ Bond Iron-On Adhesive. Do not use fabric softeners.
Don’t overheat Heat N’ Bond; this will cause an insufficient bonding.
Don’t iron over the plastic instruction sheet.
Don’t sew- due to the unique thickness of Heat N’ Bond’s adhesive machine stitching is not recommended. Also, adhesive has a tendency to stick to needle, causing damage to machine.
It is machine washable. For best results use the delicate cycle and warm water.
Heat N’ Bond is not recommended for projects or items that require dry cleaning.
Another "how to remove heat and bond" google search gave me:
I've had some success by using a slightly larger piece of scrap cotton fabric, fusing it to the remaining adhesive, and then letting it cool completely. (When impatient, I pop it into the freezer.) Then I briefly iron the back side of the main fabric and peel off the cooler scrap fabric, which usually pulls off at least some of the adhesive with it. I've also used a blowdryer on hot setting to warm the adhesive without pressing on it, so that I can scrape it away with an old credit card. I keep repeating this process; it's not fun, but it eventually works. Let us know what happens!
http://forums.threadsmagazine.com/ga...nd-heat-n-bond
And when in doubt, our own board search yielded this thread:
How to REMOVE Heat n Bond????
good luck!