My plastic loft door has gone a bit yellow, looks a bit manky compared to the nice white ceiling! Is there any way of getting rid of the yellow to get it back to white? I don't think its nicotene staining as we don't smoke, nor did the previos owners of the house, could just be ageing of the plastic maybe?

I thought about scrubbing it with bleach, but would that affect the plastic?

Thanks

Rich