Lithofin Power Clean - Tile Advice

[On one]

I'm having a slight problem cleaning some adhesive residue from some Black riven slate today(not a lot,just it is showing up on the black slate)
Diluted Power Clean is not having the desired effect, so.......can I go to neat Power Clean without etching the slate?
Or is there something stronger available for slate from the Lithofin range

 

[Rookery]

I'd probably test Litho Cement Away or Residue remover effectiveness but no doubt Bob will be along to confirm.

 

[Lithofin BOB]

You could test 1-1 power clean with a white pad, it should be fine , but test!

If you have some cement residue remover you could test,If you need to move to an acidic, would prefere lith builders clean as this has an iron inhibitor and will not activate iron oxide of present in your slate, you will need to test on an unlaid tile to determine the suitabilaty of an acidic product with your slate, make sure there is no effect to the stone after use ,dilute, test for 1-2 mins scrubbing with a pad or stiff brush , rinse

 

[On one]

If 1:1 Power Clean doesn't work, what dilution should the Cement Residue remover be?

 

[Lithofin BOB]

Start at 1-10 and bring down , may need 1-3 if quite thick in the riven areas, test on your spare stone

 

[On one]

Ooops.....I went straight in at about 1:4!
This morning I started with Power Clean at 1:1 and a black pad which had no effect,
Then went to Cement Residue Remover 1:4 and a black pad which seemed to have done the trick when I called back in on the job this afternoon, but as I was there I gave it a going over again just for safety's sake.
P.S. Bob.........no mention of slate or natural stone on the bumf on the back of the CRR?

 

[Lithofin BOB]

I did mention the builders clean,specific to slates and nat. if the slate is acid resistant and as long as you test, should be fine, be more worried on the black pad , glad it sorted

 

[On one]

Luckily enough I already had some CRR in the shed,so tried that first. The next option, the Builders clean would be a 50 odd mile round trip.