Which solvent could we use to remove uncured DM 56 and X166b resist? We just need a solvent in which the resists are soluble. Would Acetone or EBR solvent (PGMEA) work?

We have successfully used IPA, and Acetone should also work but that is of course depending on what base substrate the none-cured resin is applied to and your potential application work afterward.

For our industrial roll-to-roll machines we also used industrial-grade environmentally-friendly UV cleaner on metal and rubber parts that is in contact with non-cured UV resins. It is a liquid which is normally bought in 10kg containers. We would recommend you make a few tests initially with IPA or/and EBR solvent to see if that suits your purpose.