Reddit reviews High Definition 58mm Circular Polarizer Filter for Canon 18-55mm IS Lens + 3 Year Celltime Warranty

Here's a quick example (only watch ~10 seconds of this, rest of the vid isn't worth it, keep your eye on the reflections on the doors): https://youtu.be/eb2qgUBTNRQ?t=1m39s

He's turning the polarizer left and right, and it blocks out certain reflections. You can see how they sort-of disappear.

Here's a better video of what you're doing after using one, and how much better the pics turn out: https://www.youtube.com/watch?v=3DZylNq5mAg

And, unlike most camera gear, they're only like $10.

EDIT: OP, Buy this! It fits your stock Cannon lens!

https://www.amazon.com/Definition-Circular-Polarizer-Celltime-Warranty/dp/B005EYV236