Polished concrete clean with oil stains

[Alexander Smith]

What would be the best method to tackle this polished concrete floor clean? The floor are is roughly 2000sq ft and is covered with oil stains and soiling. I will attach pictures.
Any recommendations on chemicals etc will be much appreciated.

 

[Ken Wainwright]

Oil Off - Oil Removal Chemical - 5L | World of Clean

Oil Off is a fragrant, fast acting, environmentally safe biological cleaner for the removal of oils, grease, diesel fuel etc

www.worldofclean.co.uk