@TrevorB cheers buddy

For the light lenses I just bought turtle wax light restorer from an auto store. Mainly because it Was The cheapest but also had lease sealer in it. I think the main thing with doing them is take your time sanding! The instructions say sand for a minute or two but trust me do the first step for ages to get rid of all the yellowing. All the sand pads after that are to just get the heavier scratches out from the first pad