dsnorrod
New member
Ok guys, I need some more help here. We washed this house a week and a half ago. Used VERY low pressure because of bad oxidation. Downstreamed our usual mix of 50/50 12.5% and water with some roof snot. To take the oxidation off the whole house, we used Russ' BD200 mixed 20:1 applied with a pump up sprayer, brushed, and dwelled about 5 minutes and came back with 1000psi rinse. The oxidation came off great and the customer is happy about that, but we are at a loss when it comes to these faint streaks that became visible after the first wash. I've tried everything I can think of to get these off to no avail. We tried a second application of the BD200, re-soft washing it, spraying a roof strength mix of soap and brushing, high pressure, low pressure, and brushing on F13. WTF is this and can it come off??