Basically you will get some grease built up in the grease channel and all you gotta do is use a couple paper towels on some tongs and push the grease down the channel into the drain pan. This has worked well for me so far and I didn’t have any issues with grease going down the front leg of the griddle.
https://www.amazon.com/Blackstone-Outdoor-Grill-Griddle-Station/dp/B009971BM6