I’ve experimented with silicon trays but I don’t really like them, they restrict airflow and take up a bit of the available space. The drawers/trays are very easy to clean anyway. If you want you can use parchment paper and there are aftermarket paper trays you can buy but it’s just a faff and extra expense as far as I’m concerned. If you do use anything lightweight in it be sure it’s weighted down so that it doesn’t get whisked up by the fans into the heating elements. Sounds obvious, I know, but you could get caught out if, for example, you put parchment paper in the tray and then decide to do a pre-heat. You don’t want a fire!Are they easy to clean out the drawers etc? Do you need to line them with anything?