Can I pray at work with my trainers on even though the floor is clean?

Yes, you can pray in trainers in various footwear. We know the Prophet sallallahu alayhi wa sallam in Sa'id Bukhari is narrated, can a Nabi sallallahu alayhi wa sallam yusallifina alayhi, used to pray in his shoes. So yes, if there's a certain need, if you're in the park, if you're at work, you can pray in your trainers. Of course, if you're in the masjid, then one shouldn't be praying, you know, with shoes on the carpet and so on. But the other environments, then yes, no issue with that.