Is my hair double-processed????

I have naturally medium brown hair. A few months ago I wanted to try something new so I dyed it a light brown and put highlights in it. I decided I wanted to dye my hair completely blond after that... so I went to wal-mart and found "haircolor remover" by clairol... It said when you use it in your hair it removes the artificial color as well as your natural color (because when you dye your hair the dye replaces your natural color), and it leaves your hair a very light orange color. It said after that it is safe to dye your hair another color with permanent dye. So I dyed it blonde. Everything turned out ok, although I was SO paranoid during the process (I have heard a lot of bad hair stories). So my first question, is my hair double processed? This is where it gets kinda sticky... I liked it at first, but now hate my hair color and I want to go back to brown. I was wondering if I could use the same haircolor remover stuff, and take out this color, then dye it brown? I CANNOT go to a salon. There is NO possible way. So please don't even mention it.

oh and also....stay away from tones that are very red or purple (like those purple-brown-black shades that are popular) because blonde hair is porous and will suck the color right up...and you will be extremely purple/ red. unless of course that's what you want