To remove PVC-E glue, hydrogen peroxide breaks down the glue.

I used to purchase PVC-E glue directly from National Casein in
Chicago, but the minimum purchase is two gallons, so now I purchase
it from Schaff Piano Supply.

If ordering from Schaff or another business in a northern climate,
do not order in the dead of winter.  If PVC-E freezes it does not
return to a liquid form.

Don Barton - Barton Player Piano Co.
Minneapolis, Minnesota