Looked at a wood sided house today, guy wants it prepped for painting. At first I told myself I didn't want to do it, but it dosen't look that bad if I could price it right. Part of it is 1 1/2 story and other half is 1 story, so a 12' step ladder would get me high enough. It's not flaking that bad, I don't see a lot of old paint coming off, it's just cracked. I read some use TSP to take the finish or gloss off the old paint and then just wash every inch of it like a deck, is this the right stuff to use? If so I need a mix ratio to downstream at 20% draw. Not sure how much pressure to use 1000 to 1500psi maybe? The front is painted dryvit, but it's a smooth texture, not rough. The paint is still in good shape on the dryvit, not cracking or peeling, so I wouldn't need a lot of pressure. Anyway that's about all I know from my research, please give me some advice or tips on doing this, also I have no idea on price...please help.