Sometimes it happens when you use one of those older toilet brushed with the wire loop that holds the bristles that the metal will scratch the toilet bowl. What can you do? Actually it's simple. Cleanser with a green scrubbie should get it out with a lot of elbow grease and a lot of patience. By the way, toilet brushes without metal are much preferred.
That black plastic boot tray has probably accumulated a ton of salt and grit by now. Why not clean it up before storing it away? Simply put it under the kitchen faucet--the water gets into those indentations. That will get it 75%. Use a scrub brush for a quick more thorough cleaning.
Spring is just around the corner. Good time to clean out the old fridge. And here's a nifty idea; put a few lazy susans inside to make your food items more accessible! courtesy of https://blog.nationwide.com/spring-cleaning-tips-and-tricks/