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ph of 12 - strong stuff!
http://ukupvccleaningsupplies.co.uk/product/caustic-super-high-strentgh-tfr/
I have read every review and most of them are people using it to clean engine s or chains how do you even know it's safe on plastics
I've used the Screwfix stuff on a few conny roofs now and seems pretty good.One from today:
Just pure
What dilution rate are using Andy?I find 1 litre of screwfix into a full backpack works best.Also it works best applying it with a brush with fan jets, give the roof a quick go over, gently agitating the dirt whilst letting the chemical soak in.Leave for 5 mins then wash with pure.