@ed9c883c anything transparent, the clearer the better.
I put it on my sun visor for oncoming lights 

 @4f50b305 something this perhaps?

https://www.amazon.com/HOHOFILM-Transparent-Adhesive-Decorative-Buildings/dp/B081Q1SMQR/ref=asc_df_B081Q1SMQR?tag=bngsmtphsnus-20&linkCode=df0&hvadid=80333185902319&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=m&hvlocint=&hvlocphy=&hvtargid=pla-4583932713689090&psc=1 

 @ed9c883c exactly thanks