Vinyl floor cleaning?

I recently moved into an apartment with vinyl flooring throughout the apt, the kind that is supposed to look like hardwood floors. I have lived in this apt for 27 days and have swept and mopped about 18 times already. The floors were put in right before I moved in, so they are not old. Whenever I mop, later that evening the bottom of my feet are dirty from walking on it. Please do not suggest anything like stripping it as it is a rental unit. The floors only stay clean for about a day after a thorough mopping. I have tried swiffer wet and dry and bought a new mop and broom and am currently using pine sol. Please, help if you can!