Cleaning Patio paving with Karcher K2 pressure Washer no answer to simple question

JimboMarimbo · 14 August at 7:14PM

My house frontage paving is badly pitted and dirty from over thirty years exposure to seaside air. I have bought a Karcher K2 'home kit' which includes a special rotary pressure jet of which I have heard good things and seen demo videos.

The 'home kit' comes with car washing brush and detergent together with a 500ml 'Patio and Deck cleaner' (liquid detergent) to use with the rotary enclosed pressure washing device.

The bottle states "Ready to Use" but all other Google references state that it needs to be diluted at the rate of 500ml to 5 L of water 'in a bucket'. In fact on Karcher's own website, this accessory shows a photo of the bottle which I have clearly labelled "Ready to Use" whereas the other side of the bottle is labelled "Concentrate".

I cannot get a straight answer to what appeared to be a simple question: even Google AI having scoured the 'net couldn't answer this and was ambivalent, finally offering, and I quote, The 0.5 L Karcher Patio & Deck Cleaner

is a concentrate and is not already diluted for immediate use. You need to dilute it with water according to the instructions provided (typically 1:9) before applying it with your Karcher pressure washer. So not "Ready to Use" at all.

Any help from someone who has used this machine and its bottle of ready-or-not detergent, and can assist me, I would thank in advance, so, Thanks!

35har1old · 14 August at 9:51PM

JimboMarimbo said:

My house frontage paving is badly pitted and dirty from over thirty years exposure to seaside air. I have bought a Karcher K2 'home kit' which includes a special rotary pressure jet of which I have heard good things and seen demo videos.
The 'home kit' comes with car washing brush and detergent together with a 500ml 'Patio and Deck cleaner' (liquid detergent) to use with the rotary enclosed pressure washing device.
The bottle states "Ready to Use" but all other Google references state that it needs to be diluted at the rate of 500ml to 5 L of water 'in a bucket'. In fact on Karcher's own website, this accessory shows a photo of the bottle which I have clearly labelled "Ready to Use" whereas the other side of the bottle is labelled "Concentrate".
I cannot get a straight answer to what appeared to be a simple question: even Google AI having scoured the 'net couldn't answer this and was ambivalent, finally offering, and I quote, The
0.5 L Karcher Patio & Deck Cleaner
is a concentrate and is not already diluted for immediate use. You need to dilute it with water according to the instructions provided (typically 1:9) before applying it with your Karcher pressure washer. So not "Ready to Use" at all.
Any help from someone who has used this machine and its bottle of ready-or-not detergent, and can assist me, I would thank in advance, so, Thanks!

Have a 4 never used the detergent but have used the rotary attachment did think it was a waste of time
Once in the bucket what next?

Spikeygran · 2025-08-15T06:28:53+00:00

Some machines have a self mix facility.

I might be wrong but I think with a K2 there is no mixing function on the machine and you put the detergent hose into a container to suck up the diluted liquid.

I have a K3 and the bottles are more triangular and they fit upside down in a dispenser on the back of the machine. The K3 uses it neat and has another dial on the front which regulates the amount of water mixed with the detergent.

The rotary patio head is good, its a bit more gentle than the dirt blaster attachement but seems to do a good job.

Dont forget to wear a pair of safety goggles or glasses, waterproofs and wellies are recommended. Brilliant machines but they do splash back bits at times, but ever so satisfying, once I start I keep finding other things to clean.