So my dp does a dirty manual job and naturally has a shower every day. I keep the bathroom clean but the white plastic bath never feels gleaming even with regular use of a bathroom/multi surface cleaner. Every so often - usually on a good sunlight day I'll realise that it looks terrible and will spend ages scrubbing with a microfibre cloth, which gets rid of some of the 'dirt' but never perfectly. Any tips on what I could do to get it sparkling and then what to do to keep on top of it?