Protective coatings?

has anybody out there tried to use glass protectants (sani-shield, ettore glass guardian, etc)? if so, how well do they work, and what do you believe would be their ideal applications? I’ts my understanding that some of these products help to protect from many stains (i.e. sprinklers, etc.). but besides this, what other situations may it be suitable for?( maybe makes weekly accounts easier, I dunno.)

They make the window hydrophobic. Wfping is harder with these dispersers. I’ve heard they temporarily cover scratches & sucker marks, I can’t think of any other use except in the yachting/auto market.