My son was like this. Just keep a bottle of Shout around, soak the clothes in water, and then wash. I actually, in addition to the Shout used the Clorox for colors bleach alternative in all his wash and did an extra rinse until this phase passed. The Costco diapers were the best fit for him, but as one of the first moms stated, it depends on the baby. Also, I say those diapers were the best - they were the best at minimizing the mess, but my son still had blowouts several times a day! I usually went through 3 outfits, minimum, a day. You could also just soak the clothes and then try the Clorox for colors in the wash - figure out which of the massive messes needs Shout, but take the easy way out on the rest.
I like the advice given, and I'll remember it myself, about thinking, "at least I have a little boy here that makes me have to do this disgusting chore". That will give me another perspective on it for sure.
This too will pass, and you will be writing to someone in two years reminiscing about this period of time in your and your daughter's life, wondering where time has gone.