Oven Mate Just For Racks Cleaning Kit 5 "Amazing results with so little effort." Mrs Bradbury 03 March 2018 Bought this to give it a try. Fitted 3 shelves and two removable shelf holders in the bag and added the cleaning liquid. As I has rather more in the bag than recommended I decided to put it in the Lakeland blue tray for racks that I already had. I turned the bag over a few times over the course of a morning so that all the racks got coated. The bag did puncture towards the end as the shelf holders have sharp ends but this was not a problem as it was in the blue tray. I left it about 4 hours. Washed the racks. Perfect result, minimum effort and no mess.