Power Washing and Roof Cleaning Forum

Patrick G · Approved Exterior Cleaner

Lil help.....

SprayWash · Approved Exterior Cleaner

Where's Bruce Sullivan when you need him????

Diamond Roof Cleaning · Approved Exterior Cleaner

I would say around a 2% solution and maybe a little pressure to get the thick moss off.

waxman18324 · Founding Member Rest in Peace

I agree with Mike D.. We did a similar job back in May, which was just as bad if not worse. Plenty of rinsing was the trick for heavy moss removal and we neutralized it as well.

Hank

Patrick G · Approved Exterior Cleaner

Thanks Mike and Hank. You think a lil light pressure from a power washer? Do you agree it will come out looking like the bottom shake in photo one or brighter?

waxman18324 · Founding Member Rest in Peace

A little pressure will go a long way. It will look better.

Hank

gutterdog · Approved Exterior Cleaner

Weve done a few cedar roofs. Been a while. Wed. I did a wood deck with roof mix. Watched it change colors! There was a white film on it, i pressure washed off. Much faster than 4 stepping the wood.

gutterdog · Approved Exterior Cleaner

Also the wood was so covered in mildew, ya kinda couldnt see the deck. It blended in real well with the woods around it.

Patrick G · Approved Exterior Cleaner

Thanks Mike, I heard it may get a milky film....light pressure from washer..Thanks.

Patrick G · Approved Exterior Cleaner

Ok a big thanks to Hank for some helpful hints on my first cedar cleaning. Another big Thanks to Art who provided me with the acid and watered down the property for me as well, and I thought I could do it alone. Now lets recap, I did this cedar for 3 Bills, he just needed the green algae gone for the Ins. Co. At the end I told him this would satisfy the Ins. Company but there was more of a process to prepare the cedar for sealing which he did not want. I rinsed down with a water hose only, I think I should have tried the PW I think it would have got rid of the stuff still on shingle in last photo? Or was my mix to weak? Any comments are welcome...Thanks....

Liberty SoftWash · PWS Vender

Looks great Pat! What was in the mix? Lol.

Patrick G · Approved Exterior Cleaner

I think it's safe to post here it's just the original group, unless your breaking my chops?

waxman18324 · Founding Member Rest in Peace

Pat,

Is this the same house?

Hank

Art O · Approved Exterior Cleaner

I think if we would have made the Oxalic Acid stronger it would have turned out better. We only ha 10 lbs and added it to 30 gallons of H2o. Pat wanted to rinse, I didn't think it was needed. But it came out better then it was.

waxman18324 · Founding Member Rest in Peace

We use 12 to 18 ounces of ox per gallon.

Hank

Patrick G · Approved Exterior Cleaner

Hank that is the right house, but I only did the one car garage on the left.............

Patrick G · Approved Exterior Cleaner

Ok so a big difference on the cedar shake from yesterday. Is this look normal or is it because I didn't use a PW for rinse and cleaning?

Diamond Roof Cleaning · Approved Exterior Cleaner

That is bleached out. Not enough ox acid.

Art O · Approved Exterior Cleaner

Diamond roof Cleaning wrote:
That is bleached out. Not enough ox acid.

Thats what I said Mike! We only had 1/3 the amount that was needed.

Diamond Roof Cleaning · Approved Exterior Cleaner

Rinsing just didn't stop the bleaching effect. That's what the ox does.

Patrick G · Approved Exterior Cleaner

Ok thanks Mike, I'll get it next time...if I have one. This is ok here he just needed for Insurance company. Next time the right Ox and a good amount

gutterdog · Approved Exterior Cleaner

OX acid? That's new, to me. How does that work???

waxman18324 · Founding Member Rest in Peace

Mike,

Oxylic Acid is used to neutralize mix on wood surfaces. It's also known as wood brightener. Many hardware stores carry it, albeit, in small quantities or you can order it through your suppliers. It's in powdered form. We use it on wood decks, cedar roof and siding shakes.

Hank

gutterdog · Approved Exterior Cleaner

Ox acid after bleach? I've used it before after sodium percarb and sodium hydrox. Big difference to the wood.

After bleach??

Patrick G · Approved Exterior Cleaner

Yes afterwards Mike, I did not use the right ratio in my mix

Art O · Approved Exterior Cleaner

Should the cedar still be wet when you put the OX on or can you wait a day. I've been doing some testing and the cedar looks better when I wait a day to put the OX on.

Diamond Roof Cleaning · Approved Exterior Cleaner

We do it right away.

Ed Thompson · Approved Exterior Cleaner

oxalic acid has a nice sweet taste to it. Not like sh or hydroxide. If I accidentally eat chemicals I prefer oxalic.

gutterdog · Approved Exterior Cleaner

On decks we applied the ox acid when it was still wet.

Art O · Approved Exterior Cleaner

Whats with Bob's F-10 Percarbonate Cleaner anybody try it.

F-10 is a percarbonate wood cleaner that safely cleans wood to remove UV damaged wood fibers and restore wood to is natural color.

Depending on water hardness, soiling & application method (downstreaming, direct application. Use F-10 at dilutions of between 4 to 8 oz per gallon.

Handy 2lb plastic containers with screw top lids packed 5 per box.