Little Bit Of Advice Please.....

Discussion in 'Chit Chat & Introductions' started by OoO, Mar 21, 2013.

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  1. OoO

    OoO Guest

    We have this job to quote, i have taken a picture to show some potential issues.

    Usually when those white bits are blasted off, underneath its usually black and stained.

    Can anything be added to remove the black stains, like chemicals?

    Pre treat them?

    We use a petrol driven pressure washer, but i dont think its the calibre of what some of you guys use. We have got this turbo dirt blaster nozzle and that eats dirt.

    I dont really want todo pressure washing, so have passed it on to my dad. Had 3 calls come through this week for quotes hahaha :rolleyes:
     

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  2. Smurf

    Smurf Banned
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    With the pressure washer I use will get that surface 98% clean but for stubborn black lichen type spots I've heard it is best to use a bleach type mix.

    I don't use chems myself as can open up a can of worms risk wise if children, pets & even fish in ponds get sick and/or die. I simply explain this to customers that after if they want can put bleach down themselves.
     
  3. Donny

    Donny Well-Known Member
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  4. OoO

    OoO Guest

  5. Smurf

    Smurf Banned
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    Acid wash hmmmmm.... I will give that one a miss too :rolleyes:

    Need to be very careful what you put that on as can damage/discolour surfaces.

    This makes interesting reading if interested http://pavingexpert.com/maintain_03.htm
     
  6. Donny

    Donny Well-Known Member
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    You put it on thinned down , then rub in with a hard brush , then hose off with garden hose, then powerwash. its brilliant on rust stains lol
    Like i said i dinnae need chems very often, very rarely use em, bleach is rubbish on dark spotting lichen as you have too come back about 4 times sometimes so stuff that.
    Whats wrong with acid wash anyway guys? most brick or patio cleaners have acid in them, this CW20 is the proper stuff and USED CORRECTLY will have them stubborn marks gone , DONT use it on Sandstone , always thin it out, wear PPE, HOSE SURFACE WITH GARDEN HOSE BEFORE AND AFTER TREATMENT, read the instructions, its bio degradeable :p
     
  7. mr shine

    mr shine Guru
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    thats expensive stuff donny , id use chloras on the lichens , id powerwash first then spay the chloras on the bad areas and scrub with a deck brush and leave it dry in itself.
     
  8. Donny

    Donny Well-Known Member
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    Yes but you can thin it down to 1 to 40 , so it goes a long way, Chloras works as well, ive used it on slate roof , worked a treat, ive found CW20 very effective on black spotting. Just keep it away from glass,
     
  9. OoO

    OoO Guest

    Yeah but we are novices Donny lol, last thing i want is a bill for a new patio lol
     
  10. Donny

    Donny Well-Known Member
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    Just powerwash it then with the turbo , it will look a hunnerid times better anyway lol
     
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