Answer:
I describe a toilet cleaner as well as one of Santa's reindeer
I am a shiny metal sheet that covers BBQ food.
When I come in from sea to shore twenty paces you'll see No less no more.
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.