Cleaning render
Discussion
Depends what 'dirt' you need to clean off.
Some may just rinse off with a car washing brush on a stick.
Spraying some mild detergent may help.
Clothes washing liquid seems quite effective.
Some bird mess and other stuff may need a scrub with a stiff brush.
If you use strong cleaners like bleach or caustic soda (which is in some thick bleach productes) then you may change the colour of the paint and take some paint off.
Depends how bad it is and how far ou want to go.
Maybe start with a soft broom and mild detergent and see how it goes?
My neighbour works as a decorator and tends to use bleach and/or the active ingredient of patio magic, but we're in Devon where stuff turns green easily! Probabl different from removing smoke grime in town.
A backpack garden sprayer is good for rinsing effectively without drowning the garden.
Some may just rinse off with a car washing brush on a stick.
Spraying some mild detergent may help.
Clothes washing liquid seems quite effective.
Some bird mess and other stuff may need a scrub with a stiff brush.
If you use strong cleaners like bleach or caustic soda (which is in some thick bleach productes) then you may change the colour of the paint and take some paint off.
Depends how bad it is and how far ou want to go.
Maybe start with a soft broom and mild detergent and see how it goes?
My neighbour works as a decorator and tends to use bleach and/or the active ingredient of patio magic, but we're in Devon where stuff turns green easily! Probabl different from removing smoke grime in town.
A backpack garden sprayer is good for rinsing effectively without drowning the garden.
We have a half rendered bungalow, painted with cream masonry paint. Every few years the render looks dirty but it appears to be alge or some other growth.
We use Astonish Mould and Mildew spray on it. Work down from the top so any over spray runs down the walls. Move down filling in dry areas as you go so the whole wall ends up with a thin coat.
You can see the difference in minutes and the house looks freshly painted afterward.
Astonish is £1.50 a bottle and we use about 7 bottles to do a 4 bed detached.
We use Astonish Mould and Mildew spray on it. Work down from the top so any over spray runs down the walls. Move down filling in dry areas as you go so the whole wall ends up with a thin coat.
You can see the difference in minutes and the house looks freshly painted afterward.
Astonish is £1.50 a bottle and we use about 7 bottles to do a 4 bed detached.
98elise said:
We have a half rendered bungalow, painted with cream masonry paint. Every few years the render looks dirty but it appears to be alge or some other growth.
We use Astonish Mould and Mildew spray on it. Work down from the top so any over spray runs down the walls. Move down filling in dry areas as you go so the whole wall ends up with a thin coat.
You can see the difference in minutes and the house looks freshly painted afterward.
Astonish is £1.50 a bottle and we use about 7 bottles to do a 4 bed detached.
Thank you, I've a bottle under the sink, I'll try a test patch. We use Astonish Mould and Mildew spray on it. Work down from the top so any over spray runs down the walls. Move down filling in dry areas as you go so the whole wall ends up with a thin coat.
You can see the difference in minutes and the house looks freshly painted afterward.
Astonish is £1.50 a bottle and we use about 7 bottles to do a 4 bed detached.
Huzzah said:
Yes, that's exactly how ours reacts. It's gone in a few minutes and looks like fresh paint. First time it was quite bad so the difference was huge. At £1.50 bottle it's cheap too.
If you can't reach the high spots with the garden sprayer, you can fabricate a long extension (assuming it's one with a tank and hose).
Buy 3m of overflow pipe, and 4-5m of tube the same diameter as the garden sprayer.
Replace the sprayer hose so you now have a very long extension hose. Cable tie the spray head to one end of the overflow pipe (with the trigger cable tied open). Now you have a 3m long spray lance.
Now use the pump to control the spray rather than the trigger.
Edited by 98elise on Tuesday 10th September 21:38
98elise said:
Huzzah said:
Yes, that's exactly how ours reacts. It's gone in a few minutes and looks like fresh paint. First time it was quite bad so the difference was huge. At £1.50 bottle it's cheap too.
If you can't reach the high spots with the garden sprayer, you can fabricate a long extension (assuming it's one with a tank and hose).
Buy 3m of overflow pipe, and 4-5m of tube the same diameter as the garden sprayer.
Replace the sprayer hose so you now have a very long extension hose. Cable tie the spray head to one end of the overflow pipe (with the trigger cable tied open). Now you have a 3m long spray lance.
Now use the pump to control the spray rather than the trigger.
Edited by 98elise on Tuesday 10th September 21:38
Most mould & algae cleaners are just dilute bleach with a bit of soap & perfume so it doesn't smell bleachy. This is the ingredients list for Astonish:
Ingredients List
Product: Mould & Mildew Blaster 750ml x 12
1 Aqua
2 Sodium Hypochlorite
3 Sodium Hydroxide
4 Sodium laureth sulfate
5 Cocamine oxide
6 Modified Phosphonic Acid, Potassium Salt (NOT INCI)
Next time round just dilute down the cheapest thin bleach you can find & add a bit of washing up liquid & see how if it's just as good.
Ingredients List
Product: Mould & Mildew Blaster 750ml x 12
1 Aqua
2 Sodium Hypochlorite
3 Sodium Hydroxide
4 Sodium laureth sulfate
5 Cocamine oxide
6 Modified Phosphonic Acid, Potassium Salt (NOT INCI)
Next time round just dilute down the cheapest thin bleach you can find & add a bit of washing up liquid & see how if it's just as good.
Huzzah said:
Impressed at how well this has worked, will BAC 50 do a similar job?
Yes I use BAC50 on my house, diluted down, something like 20:1 I think.I get step ladders out and see how high I can reach, walk on flat roof, and hang out of windows to get as much of the house as I can!
Huzzah said:
Impressed at how well this has worked, will BAC 50 do a similar job?
Yes its it's very effective, and lasts quite a few years.BAC 50 should also do it. I just use Astonish as its cheap, effective and available in most shops. To do my whole house costs about £10 and the results are great so even if BAC 50 was cheaper overall I'd probably still use Astonish for the convenience.
Edited by 98elise on Friday 14th February 19:28
Mr Pointy said:
Most mould & algae cleaners are just dilute bleach with a bit of soap & perfume so it doesn't smell bleachy. This is the ingredients list for Astonish:
Ingredients List
Product: Mould & Mildew Blaster 750ml x 12
1 Aqua
2 Sodium Hypochlorite
3 Sodium Hydroxide
4 Sodium laureth sulfate
5 Cocamine oxide
6 Modified Phosphonic Acid, Potassium Salt (NOT INCI)
Next time round just dilute down the cheapest thin bleach you can find & add a bit of washing up liquid & see how if it's just as good.
Bleach works, how far to dilute it?Ingredients List
Product: Mould & Mildew Blaster 750ml x 12
1 Aqua
2 Sodium Hypochlorite
3 Sodium Hydroxide
4 Sodium laureth sulfate
5 Cocamine oxide
6 Modified Phosphonic Acid, Potassium Salt (NOT INCI)
Next time round just dilute down the cheapest thin bleach you can find & add a bit of washing up liquid & see how if it's just as good.
Huzzah said:
Bleach works, how far to dilute it?
Depends how strong it is to start with?And how green the house is!
I've found wetting the render with plain water from a garden sprayer, then applying a little fairly concentrated bleach/detergent mix works quite well.
But only if you're going to repaint!
Bleach will change the colour of some paint.
A little bit of detergent is all that's needed to get the birdpoo and grime off paint that's in good nick.
If you're trying to nuke green slime before painting, that's time for some bleach IMHO.
Gassing Station | Homes, Gardens and DIY | Top of Page | What's New | My Stuff