We just finished up with a small patio 10x10. We used the Holland pavers for this job. After we swept in the joint sand( Paver Set Polymeric Sand by sakrete) it left a white milky film to the pavers. We have used this product for all our jobs and this is the first time we have seen this. Its only in the spots where the sand was dumped on to the pavers. After calling sakrete up they told us to use white vinegar and water. We did this and nothing. What can we use to take the milky film off the pavers?