[Nameless Drudge]

Hello,my instinct says to shift this muck i shouldn`t just try to blast it off with the pressure washer and was hoping someone might suggest a solvent/cleaner.The house owner has tried a scrubbing brush and it didnt want to shift.
Have attached a couple of pics and would be most grateful for any response.

[Paolo]

I think that is there to stay but happy to be proven wrong.

[Nameless Drudge]

I didn`t quote for the work on and around the house as i was concerned the sills wouldn`t clean up leaving the customer dissapointed and perhaps not too keen to pay.

[Matt Gibson]

Sean,

Look up nebulous stone cleaning. That might shift it. I used to do alot of that type of cleaning for a company in london central.

Otherwise, a light sand, depending on how deep the staining goes. If you were VERY carefull, maybe a wet sandblast. but you would have to be carefull and mask up and protect every bit of wood/glass.

Matt

[Roger Oakley]

Very easy to get off I have cleaned loads of them, try here www.tensid.com ask for Richard Turk. They will have a chemical just for that type of staining.

[Ged]

sodium hypochlorite painted on (a very strong bleach to be used with caution and full protective clothing)would probably do it.

[Nameless Drudge]

Very easy to get off I have cleaned loads of them, try here www.tensid.com ask for Richard Turk. They will have a chemical just for that type of staining.

Cheers Roger,whats the stuff called you got it off easily with?

[BDCS]

Read through this which will help

http://www.centurywise.co.uk/techniques.asp#5

[Nameless Drudge]

Thanks for that,i even have a shortcut to their site on my desktop which i had forgotten about,have had my window cleaning only head on.

[Blast Away]

As said sodium hypo, give it 5 mins to work and then lightly pressure wash off with a fan lance. Nice and simple and you'll have them gleaming yellow like these;


 

[Nameless Drudge]

Many thanks for that,and the pics.

[drive surgeon]

is that hypo at full strengh or watered down?

[Blast Away]

is that hypo at full strengh or watered down?

Yeh watering it down. Depends what % you buy it in. It comes 14% I think where I get it. That's the strongest it's sold in according to supplier.
Putting it on neat you're just wasting it. 1 liter to 4 liters water is a good mix.

[Roger Oakley]

Very easy to get off I have cleaned loads of them, try here www.tensid.com ask for Richard Turk. They will have a chemical just for that type of staining.

Cheers Roger,whats the stuff called you got it off easily with?

Tensid's product would be light duty restoration cleaner, but as a few have posted hypo will do the trick, for that stain I would go 3:1 mix, pre-wet the surface, apply the hypo mix allow 10-15 mins dwell time, wash off stain all gone. Mask up the windows first.

[Nameless Drudge]

Many thank to all,excellent tip about masking the windows(was going to),a few minutes masking up is time well spent and appears very professional to the customer and means you have no concerns over whatever chemical you use etching glass/pvc/wood etc.
                                     

[Blast Away]

Hypo won't damage PVC windows or the glass.

[Roger Oakley]

Hypo won't damage PVC windows or the glass.

I never said to would, but they look like wooden frames to me, so a bit of extra protection wouldn't hurt. Saves having to clean the windows afterwards  IMO

[Blast Away]

Hypo won't damage PVC windows or the glass.

I never said to would, but they look like wooden frames to me, so a bit of extra protection wouldn't hurt. Saves having to clean the windows afterwards  IMO

I never said that you said that it would. 

[richywilts]

anyone got a number for supplier sodium hypo please

[Blast Away]

anyone got a number for supplier sodium hypo please

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