Power Washing and Roof Cleaning Forum

mikepas · Exterior Cleaner

Process for cleaning a metal roof?

waxman18324 · Founding Member Rest in Peace

Over the years we have done a few. Most were car ports. Depending how bad they were we hit it with a house wash and rinse. Never used wax.

Hank

BlueRidge · Approved Exterior Cleaner

We clean quite a few. We use a mix a bit stronger than house wash (10 - 15%) and double up on the surfactant, spray as lightly as possible to try to keep most of it on the roof. If it is hot, cool the roof off first. We ALWAYS rinse them! Also, I have found warm/hot water really helps if there are overhanging trees dropping sap.

Chris Mozick · Approved Exteior Cleaner

Pre rinse, hit with a two% mix then rinse very well. Like Brett said extra surfactant to keep that mix in the roof if not it will slide right off. Make sure you tie off it's like walking on ice 10x worse

Roof Stain Removers · R.I.P.

Not being sarcastic, but did anyone else see the irony of the guy who lives in HI referencing ice? Although he made an excellent point, I still had to laugh.

JohnAEC · Member

Bleach (2 - 5%) & detergent, plus a bit of pressure to lift it all off

Bryan P · Approved Exterior Cleaner

I use my house wash mix (which I mix in a bit of degreaser) and bump the bleach up just a little. The last one I did was cleaned at 1.5% It all depends on how dirty it is how much SH you'll need and also what you'll have to go through to rinse it off.

metal roof cleaning.png

SprayWash · Approved Exterior Cleaner

Like everyone else here who chimed in, I agree! Work in small sections so your mix doesn't dry, a strong mix can cause flash oxidation. Rinse, rinse, rinse, and ALWAYS be safe! Metal roofs can be some of the most treacherous surfaces out there! Sometimes it will take multiple coast of sauce.

I have used the Agent Clean Agent Halt on some roofs, it contains a wax and will restore some luster to the metal.

Chris Mozick · Approved Exteior Cleaner

Hey it snows here in Hawaii too! Nice work

JohnAEC · Member

JohnAEC wrote:
I've attached the photos as I got a message that they're not visible. Wow, there's the ability to insert from an attachment.... whatever will they think of next

Bleach (2 - 5%) & detergent, plus a bit of pressure to lift it all off

Eric Schnaible · Approved Exterior Cleaner

ike our metal roofs

-- Edited by Eric Schnaible on Thursday 27th of April 2017 01:39:17 AM

-- Edited by Eric Schnaible on Thursday 27th of April 2017 01:40:38 AM