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UK General Cleaning Forum => General Cleaning Forum => Topic started by: Ian101 on June 08, 2013, 04:38:26 pm

Title: Hypo and stubborn spots
Post by: Ian101 on June 08, 2013, 04:38:26 pm
Just done a nice patio / drive job ... drive no issue but on patio which is indian stone there were a lot of black spots so following advice on my hypo post last week i tried solution of 3 to 1 and let it dwell for 10 minutes and in fairness like magic 99% of it was gone however along edges of flags were black spots that just wouldnt shift even with 100 % undiluted hypo for 10 minutes then pressure wash they still wouldnt shift so told customer all i could do was turbo nozzle em but more than likely all the pointing would go so he said just leave it as was happy with overall standard but I wanted it all gone.

Anything else I could have done
Title: Re: Hypo and stubborn spots
Post by: Kev Martin on June 08, 2013, 08:08:29 pm
Quote from: Ian101 on June 08, 2013, 04:38:26 pm
Just done a nice patio / drive job ... drive no issue but on patio which is indian stone there were a lot of black spots so following advice on my hypo post last week i tried solution of 3 to 1 and let it dwell for 10 minutes and in fairness like magic 99% of it was gone however along edges of flags were black spots that just wouldnt shift even with 100 % undiluted hypo for 10 minutes then pressure wash they still wouldnt shift so told customer all i could do was turbo nozzle em but more than likely all the pointing would go so he said just leave it as was happy with overall standard but I wanted it all gone.

Anything else I could have done

Yes you could try Honing Powder then you would have had a mechanical cleaning action as well as the chemical action


Kev Martin
Tiling Logistics
Title: Re: Hypo and stubborn spots
Post by: Roger Oakley on June 09, 2013, 07:21:27 am
Maybe a longer dwell time say 20-30 minutes, I know what you mean about the ones along the edges being stubborn had them myself a couple of times and had to leave the hypo of for around 1 hour keeping it damp so it works. Sometimes they are easy, and sometimes a pain in the arse.
Title: Re: Hypo and stubborn spots
Post by: Barry W on June 09, 2013, 08:38:24 pm
Whats Hypo as I've got these spots in my garden and the pressure washer does not get rid of them, someone told me to put diluted bleach on them.
Title: Re: Hypo and stubborn spots
Post by: Neil Jones on June 09, 2013, 09:16:08 pm
You answered your own question Barry. Sodium hypocholrite - Hypo - AKA Bleach.