Jeff1I really never got on with it but to be fair I have never really tried it as a cleaning media and have not had the time to practise. I bought the attachments for the pressure washer and you have to regulate the amount of flow of sand that is pulled into the water flow. I have two of the attachments and they cost me a lot of money. I may have been doing it wrong but it wouldnt remove a patch of paint on my unit floor. Where I bought them from said if I brough them over with a bag of kiln dried they would show me how to use them. I am due over there next week to pick up a couple of machines!!I know you can get the big set ups but as a means of cleaning lines from tarmac I would have thought there would be a lot of sand left in the tarmac. I really must get on top of this.Joe if it is ok with you I am driving to Kent tomorrow afternoon I will give you a call, hands free when I get on the M1, about 6ishRob