I had the exact same issue. Pressure treated deck, crap Behr acrylic stain.
This is what I did. Stripped the old stain with this stuff, work it in small sections and don't let the stripper dry. Spread it like paint and remove it with a pressure washer.
Once it is all stripped I used this stuff to brighten the wood.
After that was complete I let the deck dry for a few days then I stained it with
Penofin for pressure treated wood in the Tahoe color.
The end result was much more transparent than the acrylic stain and looked better. Since Penofin is rosewood oil you can re-apply it without stripping it when it wears.
