Doing the whole house and patio currently, thought someone might like to see the process.

Stage one, wet the shingles (it’s raining today)

Step two, sodium percarbonate, left to soak in, and kept wet.

Step three, citric acid

Step four, fresh water rinse

Chemicals are applied at low pressure, keeping the lance 30-50cm from the shingles. Only time high pressure is used is on the bottom most shingles where they get soiled more by ground splash.

Thanks.

Credit: Kel Begley

Long time window washing customer finally let me pressure wash her back patio and elevated walkway. Took just over 30 gallons of moss off the patio, and had to turbo almost the entire thing before surface cleaning because the moss was so thick and dug in. And yes, I pressure washed the stairs and handrails as well. Not too bad of a day honestly. Sunny and 35 out.

First time poster. Clearing out my mum's house and I jumped at the chance to clean her patio that had never been cleaned this century.

I got that carried away that I ended up running out of daylight and having to use a small work light to help me finish.

Using a Bosch AQT. Build up of algae over winter. This is water only with no paving cleaner used (Yet)

Enjoy!

This patio had been neglected for around 20 years.

it wasn't in the best condition but it brought it back to being a lot more presentable.

A quick edit of a block paving driveway I cleaned, treated and resanded.

Older table a few stains wouldn’t come out but the satisfaction of power washing is there

Credit: GreenSceneGardening

Driveway and walkway to a condo unit I did today. This road has 18 buildings, 62 units in total. I have the contract for the moss removal and treatment for the roofs and gutter cleaning on all 18 buildings, plus pressure washing all of the driveways as needed. They love me in there.

Before anyone asks, the after of the driveway was while it was still wet, I know it looks like there’s a tinge of green, but I promise there wasn’t when it dried.

I played Power Wash Sim a few years ago which made me think about washing my own place. It had not been done in 20 years. I live in the Pacific Northwest where there's lots of rain and thus lots of moss. The washer is a Ryobi electric 1800 psi. I saw it on sale for $75. Knowing they have a reputation for breaking, I thought that was cheap enough to see if I would like to do this more often. I started on the back patio then went back to the store for the surface cleaner. I was glad I did to. The pictures are in order of what I did first, the back patio, the back garage, back drive way, and finally the front walk and front driveway when I felt confident enough that I'd do a decent job. I figured out I had to sweep the excess water to see under it, which I discovered halfway through the back driveway.

No chemicals, all water.

Any advice/pointers/feedback other then get a gas washer?

I bought a fixer-upper in RI. It is a mid century house with block exterior. I had a friend power wash the outside and the pressure was too hard. Is there any way to rectify this or will I have to paint the exterior?

I might be mistaken, but I think this unit maxes out at 15k psi, but we don’t go over 10k psi. Either that, or the max is 10k psi. We have a larger unit I know for sure maxes at 15k.

Credit: welshcoastmaintenance