If you are sure it is a vinyl, then clean it all again, try using a heay traffic floor cleaner, we use Clover gel or Lemon floor gel, but you need to mop a diluted solution on leave it for a few minutes and mop again, (this gives the floor cleaner a chance to work, and we use it at a haulage firm)then rises the floor with clean plain water a few times until there is no trace of an chemicals left on it and use a floor polish , most modern polish you apply three coats, 1st one seal second and thrid polish. Just read the label on the one at work and it should say whether or not it is a polish and the proper instructions should also be there.
Hope this helps
Petra