You need to make sure you get all of the mold / crap out of there . Behind the foam too or your chancing making you and the girls sick to say the least .
This is exactly why I refuse to use mylar anymore = crap living between the walls -n- mylar . I too am a basement grower . Clean the hell out of it and use some KILZ to prime the walls and add "Mildex" = mold / mildew combatant to the final flat white topcoat of paint . Mildex is aval. at Homedepot / lowes / Ace hrdwr etc...
Peace
Crispi :jointsmile: