[paolo82]

Hello all
 Need some professional advise on how to get 15 year old patio area cleaner after a wash.
im using a honda gx390 21l a min with a turbo nozzle  but the dirt is still inprinted on the slabs.
here are some photos of before and after. was thinking of using a strong chemical . can someone please recommend a good one to use.
im having problems uploading pictures will follow shortly

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[Rob_Mac]

Chris

Answer this mans question. I can't answer it because i have the force of flow & pressure that licks all surfaces clean. You on the other hand don't so need chemical assistance (in more ways than one)

Rob

[paolo82]

thanks rob
if my pictures uploaded you could see the patio was really dirty , i thought the pressure im using was more than enough . i was wrong . prob need a bit more practice as this is my first attempt. so do you think hypo will clean better

[chris scott]

Would like to see a picture first ....but Sodium hypochlorite and wall paper paste mixed  together deals with general staining, black spot etc

[paolo82]

 
    im still having problems uploading photos,  im clicking on insert image then upload image but nothing.
will try again
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[chris scott]

Try uploading them to photobucket.

[Rob_Mac]

Rob

[johnny bravo]

do you download photo bucket onto comp.

[Blast Away]

Use http://tinypic.com/

Upload your image from your computer, on the 'resize' select 'Messageboard', when it's uploaded they'll be a selection of links, copy the link for forums and paste into the area when your writing a post.

[paolo82]

hi all thanks for you help, used tinypic to resize .cheers blastaway. hope this will help to decide if i need chemicals

[paolo82]

so was wondering wot advantages do i have with mixing hypo with wall paper paste, never heard of this.
 Is it just to thicken the hypo so it stays on the slabs?.
   would you still apply with watering can?

[chris scott]

If you mix with wallpaper paste it will stay in contact with the substrate longer/better. Some mix with soap but this causes bubbles,the surface area of a bubble is in the convex so it actually lifts from the substrate. Soap will work . Example :For removal of say felt tip pen on something like sandstone you need wallpaper mix.

[Roger Oakley]

If you mix with wallpaper paste it will stay in contact with the substrate longer/better. Some mix with soap but this causes bubbles,the surface area of a bubble is in the convex so it actually lifts from the substrate. Soap will work . Example :For removal of say felt tip pen on something like sandstone you need wallpaper mix.

Mod note;  Swearing; even with asterixes, aint allowed. 

[Blast Away]

That's some sea breeze in Southport, Chris.

[paolo82]

 so is there no need to add wallpaper paste?  better used with just water
and wot else can i use to clean the remaining dirt other than hypo

[BDCS]

I use wallpaper paste for wall paper although a foodgrade version without algaeside is used to thicken american cream soda. I will research a product that forms square bubbles which would add greater surface contact. I also have heard of an alternative that I am unable to disclose due to being sworn to secrecy by Yoda. 

[chris scott]

If you mix with wallpaper paste it will stay in contact with the substrate longer/better. Some mix with soap but this causes bubbles,the surface area of a bubble is in the convex so it actually lifts from the substrate. Soap will work . Example :For removal of say felt tip pen on something like sandstone you need wallpaper mix.

Chris,
I was actually starting to warm to you, but you are talking complete s**t, F*ck me no wonder you ain't got no work!!

Sorry to offend Roger
Ask any conservator ...it's a well known "trick" to to add starch to make poultices stick to substrates. It's bio degradable ,safe to use with bleach and can be mixed on site to your own requirements.
Pictures show the Samual Bamford mamorial Middelton. Polictices were made from wallpaper paste (starch) and NaClO.
 On this occasion the national trust would not allow me to use 30lpm to remove old felt tip pen staining from there heritage monument....can't think for minute why.

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[Rob_Mac]

Well That hasn't removed all the pen and has left a light streak across the stone.

If you are going to do as you have wouldn't it be better to poultice the whole of the side, therefore gaining an even patina?!

Rob

[Roger Oakley]

And some soap is not biodegradable true, this is why you will have seen in previous threads my statements of using certain soaps, you are using the wallpaper paste as a thickener, no more no less.
Not needed in the work the OP was asking for, you are just complicating things.
But from your after photo when you have removed the felt pen it stands out a mile, my cleaning process would have evened the whole area up, not a "this bit has been cleaned"

But me & you will beg to differ.

[chris scott]

Well That hasn't removed all the pen and has left a light streak across the stone.

If you are going to do as you have wouldn't it be better to poultice the whole of the side, therefore gaining an even patina?!

Rob

Rob have you ever tried to remove  "old" felt tip pen from  a porous substrate. There is nothing to remove physically only a stain.
You would not believe me if i told you i then sprayed it with live yogurt to speed up the "going green" stage there by ageing it again.
The job was not to "clean it" only to remove the graffiti.