Mark Leverton

Wed 15 Jan 2014 07:48pm

Hi Kevin Probably best to replace them with new blocks if it's only a few. If the driveway has been down a while the new blocks will stand out a little but will soon weather , Any kind of hydrochloric acid based cleaner could end up doing more harm than good and ruin your driveway, especially as I assume it's concrete paviours? . You can find more details at paving expert . com Mark Surrey Hills Landscaping

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Adrian Green

Wed 15 Jan 2014 03:35pm

Hi, Go to any builders merchants and purchase brick acid, this will do the job just paint it on it should bubble up then wipe away,make sure you wear gloves. Best wishes Adrian Freeman and Green

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