Hi Roy.
I wouldnt bother with them at all.
go to you local chemist and get ....
1, for lenses, get a bottle of isopropyl alcohol and surgical cotton wool.
2, for mirrors, get a bottle of distilled water and again surgical coton wool.
you might have to explain to the chemist what the alcohol is for, its the stuff some alcoholics use
You use distilled water as tap water has impurities that can corrode a mirror surface and we use surgical cotton as its completely free of lint and scent.
It'll cost 10-15 euros for the lot but will last you for years.