Remove the downspout first.
How to remove aluminum gutters.
Using a soft bristle brush scrub with one part bleach and four parts water solution.
For aluminum try gutter zap which removes electrostatic bonded streaks with little scrubbing.
Put the claw of 1 hammer on the head of the gutter nail then hit it with the other hammer when the nail is loose give it a firm follow through hit.
These may require you to vigorously scrub or make take several attempts but it can all be removed.
With the above safety procedures in mind use a power drill in reverse or a screwdriver to remove the screws underneath the roof or in the siding holding the gutter in place.
Then simply place the block in the gutter and use your hammer or pry bar against it to pull out the nail and remove the ferrule.
Simple green makes a concentrated environmentally safe cleaner with good stain removing properties.
Finally wipe the surface to remove mold spores.
Pour 3 hydrogen peroxide into the spray.
Be sure to follow the manufacturer s instructions and recommendations for any cleaner.
You can also use a bleach spray like clorox with bleach.
Now it is usually slipped completely out without damaging the gutter.
It might sound convenient but letting a large piece of gutter fall to the ground is unsafe.
Allow it to stay on the surface for 10 minutesuntil hydrogen peroxide kills the mold then wipe the surface to remove the mold and any stains it leaves.
You can make a pry block from scrap 2 4 or 2 6.
Scrub the gutters with the soap mixture to clean them.
Measure the gutter and cut the block to fit snugly between the fascia and the outer lip of the gutter filling the void with solid wood.
If the gutter is very long be cautious removing it.
Step 3 use an extended gutter brush to clean downspouts being sure to disconnect them carefully.
You need to do this step first because an attached downspout makes removing the gutter more difficult and awkward.
Rust residue dirt buildup and corrosion can all be removed by scrubbing the gutters clean.