You might consider lowering your antifreeze blend from 50/50 to something like 30/70 or 40/60 (more distilled water) depending on how cold it could possibly get in your area. There are freeze protection charts on a lot of antifreeze bottles and 50/50 goes to -34F. More water cools better.

Add a little Water Wetter (maybe 1/2 bottle) along with your increased water blend.

Maybe use some engine degreaser & power washer on the radiator's outside while it's out & you can get at the whole thing. Maybe flush the cooling system too before putting in your new coolant.