Aluminum Siding Wash

[Pure-Pressure]

I have a bid to do an aluminum/Metal siding business this week. The building is only about 4 years old and around 3000 square feet, no trees or land scaping in sight, only gravel all the way around the building.
It has a metal roof and in mostly just covered in mildew and surface dirt. I am planing on using my house wash mix of 3 gallon of SH, 2 Gallon of water and a cup of detergent. It works great on vinyl, but this is my first metal building.

Am I safe with this mix or sould I use something else?

Any suggestions?

 

[Squirtgun]

Cut back on the SH about 1/2 and you'll be fine.Excessive Sh will rust the screw prematurely.Also,rinse,rinse,rinse!!!!

 

[Pure-Pressure]

Cool, Thanks!

 

[Russ Spence]

squirt is on the money and dont let it set too long either ,cut your normal dwell time way down

 

[MikeB]

metal

the mix of 70% water 30% sh are you using tsp on the metal
also how about dryvit what are you using
russ thanks for alll the info you have given me
i wish it wasnt 20 outside here in CT i want to start cleanning

 

[Russ Spence]

its about 35 here and i am going out so i will think about you guys,more sissy flatwork to clean ...hahahaha

 

[MikeB]

35

russ 35 that sounds so nice right now this morning it is -15 with the wind it really sucks

 

[Aqua Force]

Is this mix intended to be downstreamed or x-jet?
I've never done metal either but have a place I'd like to make a pass at that is super filthy.

 

[Russ Spence]

i use it where i can apply it at around 10% SH ,in other words about 9 to 1