We are pretty serious about keeping those strips white and tried a number of products. Ana purchased a product called 'More Nine' manufactured by Matt Chem (?). I struggled to get hold of more and eventually emailed the manufacturer ... it is so good that I had a number of bottles shipped out from ST Martin
. It is actually a black streak remover but seriously ... spray it on the white ... turns yellow and requires quick removal
leaving it white as snow! Amazing! It is also the best product we have come across to remove streaks which we do every time just prior to waxing and polishing!