i use DRAINO .it takes the ATO stain right out.i use garden sprayer to put it on .let it sit for 20 minutes. then brush and hose off.
i wore no gloves.
do it on cludy day as it will dry to fast, you need it to sit for a little bit.
i do it twice as i use 1 and 1/2 gallon for like a 16x16 deck.
then use deck brighten to nuetralize it.

drain cleaner works best for me.i have ipe wood.
i took a piece of regular treated lumber and dipped it in the draino, boy it was in there only 1 minute and it cleaned that board .