Jason Thompson
You will need to clean the areas ideally then apply a couple of coats of stain block. Depending on how bad the staining is you could use any brand from DIY stores. If they are particularly bad go for a dulux or zinsser branded stain block. Ventilated well when doing so. Once done with this stage, go ahead with the normal 2 coats of emulsion. If your going to rent again may be worth using a diamond based emulsion to hold off staining and marks better.
