Hi all,
I am thinking of buying the Karcher K2 mainly for washing the car and cleaning our aggregate concrete driveway.
However there are certain spots on the right side of the house that has excessive concrete/cement patches on the bricks. I want to know if this model of the pressure washer is strong enough.
Please advise.
Thank you.
If you attach the K2 hammer drill attachment.
Just use your fingernails
The dirt blaster attachment placed very close may have a chance
What is the ozbargain recommended hi pressure washer?
Your neighbours.
something petrol
Nope
Suggest you call a concreter and ask them.
We used to use Spirits of Salts (Hydrochloric acid) years ago.
Dangerous stuff if you weren't careful but something like Builders Edge 750ml Cement 'N' Concrete Remover from Bunnings should work nearly as well.
https://www.bunnings.com.au/builders-edge-750ml-cement-n-con…
thanks for this! it looks promising.
Use eye protection for the love of God
yes, need a bit of protection on HCl but won't kill you, unless you drink it. Just make sure your rubber gloves got no hole in it, and have plenty of clean water next to you to avoid it eating too deep into your mortar/make your brick look blemish.
Make sure you don't accidentally switch the settings then wash the driveway and remove the paint from the car.
Hysroclauic acid and a paint brush first
The K2 is an entry level domestic machine with a maximum runtime of around 20 minutes of on/off use.
You can wash your car and maybe a small garden path.
That's it.
If you have a reasonable sized driveway to complete in one go, you need a machine with more water flow and pressure. Asking your K2 to do it will cause premature failure.
And don't listen to the fearmongers who tell you that you will take the paint off your car or destroy the concrete. The force of the water jet is directly proportional to the distance that you keep between the nozzle and the job.
Common sense is awesome.
It might if you angled it to direct the water jet so that it can lift the cement off by getting between, if the surface was right for a good bond then you may not remove all the unwanted material easily, use a thin spatula to carefully pry and scrape (test to see if that damages the surface) unwanted cement off and any residue/stains left may be dissolved with Phosphoric acid, Bunnings sell 2 different phosphoric acid solutions at the moment where I live (Smallest Bunnings in Australia) but there were more than that in the bigger shops, the difference between the different brands/types is what they are marketed for and the strength, I always buy the stronger or cheaper per strength/size and dilute to my needs, phosphoric acid can also be purchased from Mitre 10 as a generic item not marketed for any purpose (at least at the Mitre 10 my employer had an account with at Clarence St Sydney) or a panel beater suppliers marketed as a rust converter/surface prep for metal, there are no other compounds in Phosphoric acid solutions other than the carrier (Distilled water) and the surface reactant (Phosphoric Acid)
Don't ever buy anything Karcher. Not even the head office in Germany will help you out.
I dont think any pressure washer is going to remove concrete from brickwork…
Might need a photo to see what you are referring to.