I went back to pressure wash the effected area a few weeks back, cleared as much of the sealant and sand that we put down.
It was a good test for the Resiblock Sealant that we use for most of our jobs.
At Prosift Cleaning we use a 3600psi pressure washer, its one of the best on the market and yet it still had trouble removing the Resiblock sealer that we use. So it was good to see that the product we use does exactly what it said on the tin!
So, the Technical Director for Resiblock got back to me regarding white stains, we both agreed it was from using oil stain remover as it was only effected in that one area and the rest of the driveway was fine.
Hear is an extract of the email he sent how to deal with it
It may be necessary to use a proprietary product i.e. heavy duty paint andvarnish remover to remove the congealed Resiblock Trade from the joints thereafter, joints treated with Resiblock Oil and Grease Remover, full pressure washed off, re-sanded and resealed.
The difficulty with the above is being satisfied that you and I have removed the oil and grease staining, as any unwanted residual staining may result in the same problem. Where this occurs there is only one alternative, to replace the blocks which have been stained.
I would suggest that Resiblock OR is probably the best oil and grease removers in the United Kingdom, to this end I enclose a link to www.pavingexpert.com.
http://www.pavingexpert.com/refurb_02.htm
You will see from www.pavingexpert.com 's own instructions that on occasions
some blocks may be so badly stained i.e. the oil is so absorbed into the
block that full removal is not possible. As mentioned, the only way to
alleviate the problem is to replace the affected blocks.
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