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SH surface help

Hoops

Member
Messages
58
Location
Guernsey (Channel Islands)
Hi guys, 

I am constantly searching the web and studying about all things softwash/SH based! One thing I can’t seem to look up is a definitive list of surfaces whereby you cannot use SH or where you must use weak solution. 
So far we operate using basic rules:

PVC: 1% mix 

Render: 1-2% mix 

Roof: 3-5% mix 

Patio/Block paving: 4% mix (do not use on limestone) 

We saturate all plants and grass in the area as well as any lead the solution is likely to run on to. 
we are also extremely cautious around metals like aluminum. 
 

Don’t always operate from bottom to top, either way has left all surfaces looking great. 
 

Always suitable PPE, always safe spray techniques to restrict overspray, always use professional and purpose made surfactants. 
 

Read many articles that suggest SH is usually dead after around an hours time, sometimes quicker in heat. That being said we still rinse thoroughly and instruct that pets and children stay out of the risk area for two hours post application. 
 

Does anyone have anything to add? Have you guys had any problems on certain surfaces that should be noted? The main one seems to be limestone patios but I’m sure there have to be many others out there? 

 

Pjj

Premium Member
Messages
10,940
Location
Cornwall
Hi guys, 

I am constantly searching the web and studying about all things softwash/SH based! One thing I can’t seem to look up is a definitive list of surfaces whereby you cannot use SH or where you must use weak solution. 
So far we operate using basic rules:

PVC: 1% mix 

Render: 1-2% mix 

Roof: 3-5% mix 

Patio/Block paving: 4% mix (do not use on limestone) 

We saturate all plants and grass in the area as well as any lead the solution is likely to run on to. 
we are also extremely cautious around metals like aluminum. 
 

Don’t always operate from bottom to top, either way has left all surfaces looking great. 
 

Always suitable PPE, always safe spray techniques to restrict overspray, always use professional and purpose made surfactants. 
 

Read many articles that suggest SH is usually dead after around an hours time, sometimes quicker in heat. That being said we still rinse thoroughly and instruct that pets and children stay out of the risk area for two hours post application. 
 

Does anyone have anything to add? Have you guys had any problems on certain surfaces that should be noted? The main one seems to be limestone patios but I’m sure there have to be many others out there? 
Why can’t you use hypo on sandstone ??? Been doing that for over 15 years and so far never had any problems. We do loads of window sills they come up like new 

 

Pjj

Premium Member
Messages
10,940
Location
Cornwall
It’s limestone you’re not supposed to use it on as it can react and turn the stone brittle apparently? 
Ok never Hurd that , we use it on Indian sandstone patios all the time and sandstone window sills although it’s not a common product down hear . 

 

Hoops

Member
Messages
58
Location
Guernsey (Channel Islands)
Ok never Hurd that , we use it on Indian sandstone patios all the time and sandstone window sills although it’s not a common product down hear . 
Seems to bring sandstone up brilliantly. I spoke with a local paving expert recently who tried selling me some overpriced cleaners and he said SH is not suitable for any natural stones but all I’ve ever heard is to never use it on limestone. 

 

Pjj

Premium Member
Messages
10,940
Location
Cornwall
Seems to bring sandstone up brilliantly. I spoke with a local paving expert recently who tried selling me some overpriced cleaners and he said SH is not suitable for any natural stones but all I’ve ever heard is to never use it on limestone. 
I have used it for over 15 years on natural stone and not had any problems hears one we did last week customer didn’t want all the black spots removing just kill the algi and freshen up the colour 

DA44D2E3-9A19-440D-A6D9-86DB9C4ACFEB.jpeg

EFDC5D71-710F-4834-82DF-22827728F4C9.jpeg

3A789909-7AEC-4792-A2CC-3A6A0962BF08.jpeg

940AAF76-F88E-4ED2-8D54-59EA01CA551B.jpeg

 

Pjj

Premium Member
Messages
10,940
Location
Cornwall
Hi guys, 

I am constantly searching the web and studying about all things softwash/SH based! One thing I can’t seem to look up is a definitive list of surfaces whereby you cannot use SH or where you must use weak solution. 
So far we operate using basic rules:

PVC: 1% mix 

Render: 1-2% mix 

Roof: 3-5% mix 

Patio/Block paving: 4% mix (do not use on limestone) 

We saturate all plants and grass in the area as well as any lead the solution is likely to run on to. 
we are also extremely cautious around metals like aluminum. 
 

Don’t always operate from bottom to top, either way has left all surfaces looking great. 
 

Always suitable PPE, always safe spray techniques to restrict overspray, always use professional and purpose made surfactants. 
 

Read many articles that suggest SH is usually dead after around an hours time, sometimes quicker in heat. That being said we still rinse thoroughly and instruct that pets and children stay out of the risk area for two hours post application. 
 

Does anyone have anything to add? Have you guys had any problems on certain surfaces that should be noted? The main one seems to be limestone patios but I’m sure there have to be many others out there? 
Be careful using it on anodised aluminium this is what I did with two doors ?? think the dwell time was to long . 

1BE87261-6CAB-4F64-B846-72BE28AFC168.jpeg

A34D1A71-426D-4DE8-A085-FC9172D81405.jpeg

4A8565E0-78A8-40C2-AC7F-E690464CDA90.jpeg

 

Hoops

Member
Messages
58
Location
Guernsey (Channel Islands)
I have used it for over 15 years on natural stone and not had any problems hears one we did last week customer didn’t want all the black spots removing just kill the algi and freshen up the colour 

View attachment 24552

View attachment 24553

View attachment 24554

View attachment 24555
Absolutely awesome job that mate! A friend of mine just used a weak mix to pre treat his limestone before pressure washing and it came up brilliantly! Just repeating what I’ve found that’s all..... haven’t had a bad experience with it yet at all. 
 

 
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