Pergo is useless... I called them too and they told me to use amonia and water... I've already done this 7 times, and it did not touch it. DIRTEX works okay, but onbly for light glue residue... I scrub on my hands and knees 3 times with this; it's better byt not perfect. Same thing for GOOF-OFF2, water based... better, NOT perfect. I too am frustrated ... ANY OTHER SUGGESTIONS????