The answer to 'when to replace gutter cleaning' is that you should typically clean your gutters 1-2 times per year, in the spring and fall. Proper gutter cleaning helps prevent water damage, roof leaks, and other issues caused by clogged or overflowing gutters.
The best time to clean your gutters is in the spring after the trees have finished shedding leaves, and again in the fall to remove any remaining debris before winter. However, you may need to clean them more frequently if you have a lot of trees around your home or if your gutters tend to fill up quickly.