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patio slab cleaner

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fishing81 | 09:10 Sat 02nd Jul 2011 | Gardening
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I have given our patio slabs a clean with a pressure washer but it's left some black marks,can anyone recommend a patio cleaner which will help to clear them
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Sodium hypochlorite from a farmers' supplies or similar is the best. Dilute 1:3 with water, sprinkle on, wait about 10 minutes and then hose off. Be careful, as it has a strong bleaching quality - farmers use it to clean milking parlours.
fishing - what are your slabs made from?
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thanks for the info annemollie will give that a try and TonyV they will be concrete they are not made from sandstone or similar
if concrete and NaOCL does not work (it is very corrosive and chlorine fumes can cause internal burns) use a standard patio cleaner - most normally have a dilute acid in them - normally HCL (Hydrochloric acid)
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thanks TonyV willhave a look at the patio cleaners
The last time I used a bleach based patio cleaner all the cats in the area came visiting . They love the smell and love rolling on it .
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I shall only try the stuff on one just to see how it goes thanks modeller

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