I would like to know the proper ratios for mixing your own cleaner & brightner. I'd also like to know the square foot coverage of the solutions. I'll be using sodium percarbonate to clean. I'd like to use a mix of oxallic acid & citric acid to brighten. I'm considering a solution of borax/boric acid for its insecticidal & fire retardant properties. Is anyone familiar with this? Should it be applied before or after the sealer? My deck is pressure treated lumber, about 1-2 years old, with a rough sawn poplar ceiling (it's covered). The house is sided with western red cedar, about 15 years old & I don't think it was sealed within the last 10 years, if ever. We plan to seal everything with ATO. Thank you for your help.