I've been having a nightmare lately . I've recently cleaned a drive way with a 0.4 hypo mix half water half hypo was a very hot day rinsed well and left the customer was happy at the time . I've had a phone call saying that there's light white paint like marks on the drive way which is a soft of fiber glass plastic ridged looking driveway which isn't usuall looking type of surface I'm worried that I have damaged the lot anyone have any info on this