For aluminum try gutter zap which removes electrostatic bonded streaks with little scrubbing.
How to wash aluminum gutters.
On a windy day some of the spray might fly back into your face and you don t want this stuff in your eyes.
Use a sprayer attachment if you have one and spray the gutters from the ground to rinse them.
If you have aluminum gutters you ll want to be careful when choosing a chemical as some may cause aluminum to corrode.
Another option is to spray the gutters down entirely at the beginning so that you can turn the hose off.
A simple solution of water and white vinegar works very well for cleaning the outside of the gutters and won t corrode aluminum.
Spray a five to ten foot section at a time because otherwise the gutters may dry before you have cleaned them.
Rinse the gutters with a hose.
It attacks the oxidation and not the paint or material.
Spray the gutters put on your safety glasses and don rubber gloves if your skin is particularly sensitive to cleaners.
Aluminum readily welcomes a solution of warm water and acetic acid more commonly found in the kitchen as white vinegar after scooping the gunk from your gutters with the trowel mix a bucketful of solvent using 1 cup of vinegar for every 3 gallons of water.
F 13 gutter grenade is a multipurpose gutter cleaner that s safe for all types of gutters.
Use this solvent to scrub off the outer surface of your gutters with a stiff brush or a piece of cloth.
For that mix half cup of household liquid detergent with a half cup of bleach in two gallons of water.