For those of you who put Gutter Zap on to clean the exterior of the gutters, How do you put it on? Do you spray it on thru the down stream injection in th PW? Do you spray it on thru a sure flow sprayer? Pump up sprayer? Brush? etc...
I use a chemical called Miracle Wiz which I get locally. First I wet the house and gutters with the PW. Then I dip in my brush in a bucket and put on the chemical. I have to brush the gutters a little then I hose off the gutters with the PW. The gutters come out like new.
I pay around $45 for 5 gal. of this stuff. If I get it on the siding of the house I have to get it off immiedetly or it could strip the house color a little. Strong stuff no doubt but not strong enough to just spray it on to completely take out the black lines on the gutters.
Also what is the cost for this product and is Exterior the only company that sells it?