Hi Dave, yes they are Marley vinyl tiles, we would use a safe degreaser first to deep clean in combination with microcleaning mop pads, this will give great results, for sealing afterwards we would apply Nano Power Shine which is ideal for any vct as once applied you never again need to strip the floor, if you would like any further information email
info@jskcleaning.ie and i will be happy to send it on. Regards Tadgh