redwood sided house

Good afternoon, Because i am new to this i am here is to get some advice, feel free to give me any input, feel free to tell me what to do and what not to do.
I am about to Clean a redwood clapboard house. the house is 13 years old and was covered with an oil based clear wood finish.
The customer has a redwood barn that was washed three years ago with bleach and tsp. he then restained it, and is happy as a clam with the results. He is expecting me to do the same but i want something better, i want a better result. after reading which chems to use this will be my plan of attack.

(as to the staining over stain he thinks all the old stain will come off with the washing)

Using cold water only I will wet down the house by section and then apply a sodium percobonate (oxiclean) let sit for 15 min soft wash the house,scrubbing where needed and only using pressure when needed.
Rinse
wet down the house and apply an oxalic acid and then rinsing, making sure to rinse well.

I understand that this will not produce the best results but i believe the home owner will be happy with the outcome. as i get better i will be able to do better work. WE ALL HAVE TO START SOMEWHERE!!!!!!!!!!!!!

Question, will the plan i want to do be any better then just using bleach and tsp?how tight of a grain does redwood have? Should i use the oxalic with old stain on there?
thanks steven

See your post about cedar sided house.

Thanks, but the post about the cedar house does not ask these questions so again i ask, can ox acid go over any of the stain that does not come off the house?

I would use stripper regardless how much old failed stain is left. You want to have a fresh surface to work with. The purpose of Ox is to neutralize the ph of the wood that the stripper messed up. Wood turns dark after using stripper, that is why one would use ox.

FWIW I always use oxalic whether cleaning with percarb or stripping

Me 2. Strip with a good caustic. Percarbs suck as strippers by comparison. Bleach takes the natural color of the redwood out. I would avoid bleach. Expect the wood to turn extremely dark from tannins. Finish with a strong neutralizing acid bath. Ox is OK, a blend is better - particularly on redwood. I like more citric in my redwood neutralizer. What I sell is oxalic, phosphoric, and citric blend.