I would suggest that instead of removing it that if you have removed the crystalized layer you simply apply a fresh coat of the zep.
How to remove zep floor polish.
Zep makes a stripper which should get it off.
We have a laminate with some kind of a polymer on it mop and glow bonna floor polish.
The ammonia causes it to kind of blister and let loose.
We will wait two minutes and then gently wipe of the stripping solution with a paper towel.
To remove wax use a quart of ammonia with a degreaser type of detergent whole bottle of joy and lots of water.
How to strip the floor using zep floor stripper.
Kind of mop it on let it sit for a bit and then hose off.