Concrete on K-Rend

[Trw144]

My patio slab has just been poured and despite the render being covered, a couple of splashes of concrete found its way onto the render (k-rend). Does anyone have any experience of removing concrete from render. My first thoughts are try and "pick" it off with a sharp knife. K-rend support said they are aware of people using brick acid but they have never tested it themselves and I personally did nt fancy risking it.

Edited February 1, 2017 by Trw144

[jack]

Have a look at this stuff as well as acid:

 

Might be a bit less harsh.  Perhaps test both options in an inconspicuous area?

 

 

[Trw144]

7 hours ago, jack said:

Have a look at this stuff as well as acid:

 

Might be a bit less harsh.  Perhaps test both options in an inconspicuous area?

 

 

Thanks. I  tackled it with a brush and some soapy water and its got 99 percent of it gone. There are a couple of areas where it has a couple of small "splats" - these seem to come off with a sharpe pointy knife but I need to spend some more time on these bits.