Pressure Washing Concrete

[ZebbyUK]

Hi, mother-in-law has concrete going around her bungalow that needs cleaning with a pressure washer. It's going green in places and is becoming slippery.

The path is a DIY job and I have no idea if it was sealed or not. After I'm pressure washed the surface, does it need to be sealed?

[Mexican18]

What do you think will happen if it is not sealed?

[Baldric]

Just PW it, job done.
Do our Drive every couple of months, no problems.

[Postdog]

What Baldric said.

[Gizmonster]

Why not use a cleaning solution, instead of a pressure washer??
I used to use my power washer to clean my patio, but have found a great product called Dairy Hypochlorite. You simply dilute it, pour it on (I use a watering can), agitate it in, leave it a few minutes to do its stuff, then swill off with water.

This is the stuff I use: https://www.evansvanodine.co.uk/shop/product/173-r064kev-r064nev-r064sev/

£11.55 for a 25 litre tub, although there will be postage to add on top:
https://www.quillproductions.co.uk/products/dairy-hypochlorite-25ltr