hi nick, you need to strip it using an emulsion polish striper, carefree stripper is the one i use, read what it says on the jar, put that on the floor diluted with hot water, then scrub it with a black pad, suck all the resedue off the floor with a wet vac, then neutralise with viniger, depending on how thick the polish is you might need more than one scrub off, after the viniger has dried depending if they want you to re aply polish, put 2-3 coats of carefree eturnum, might be expensive but well worth it.
good luck nick
kind regards jonny
let acstle take the hassle