Hey fellow washers. I have been running into a problem with some vinyle jobs recently, need some advice. I downstream 15% sh with simple cherry straight out of a bucket with a resulting 10:1 ratio. cleans well but every now and then I get an bad finish. The siding appears chaulky, and has a dried drip look to it (usually brownish in color). When I wipe the siding with a damp rag (after cleaning), the color of the siding is on the rag. I'm thinking the 15% is the wrong product. This is what I use on my roofs. Any help would be great. One more thing, we don't always scrub the entire house. Usually its a downstream and a rinse only. Our mix in the bucket is 60% sh, 40% cherry..thanks, bob