This works best if the hose is on a.
How to clean pergola roof.
But your hard work will pay off.
Regular clean ups will ensure that these stains are tackled and your pergola looks elegant all through the year.
Here is a link for the thompson s water seal i used.
Most manufacturers and installers seem to recommend to clean your polycarb roofing pretty regularly with warm soapy water and a soft brush.
Rinse immediately after each section.
If it needs cleaning you can use a low pressure power washer to clean away any debris or mud.
Leave it on for a few minutes and use a brush to gently rub the stains off.
You want to keep the bleach concentration low to avoid staining or damaging the wood.
If this doesn t work you can sand the pergola and apply a fresh layer of stain and sealant.
Mildew and mold can be cleaned with a mixture of bleach and water.
It sounds like you ve let it go for a while so you might have to hit it with something a bit harder.
In a bucket combine some cold or warm water with some liquid dishwashing soap the kind you use for washing.
How to clean an aluminium pergola.
To remove stains and mildew mix a cup of vinegar oxygen bleach with a gallon of plain water and apply it on the stains soon after hosing down your pergola.