Have you used steel wool pads to strip vct about 7500 ft with 30 years of mop&glo and many coats of wax with dirt under the wax. I starts today about 20 ft done but even a new black pad under 175 not really doing much. I used zep stripper mixed stronger and still no luck. I used the steel wool pads before but wondered if I'm missing anything and yes I did give the zep dwell time I.m open for any help. Thank you. jz.