Why are my Crash Cymbals brown?

I joined my schools marching band this year, and the crash cymbals I use are... brown.

This question may be lengthly, but please stay, I really need your help!

My cymbals are Sabian, but you cannot see the logo. We just know the brand because they are exactly the same as another pair of cymbals, but the other pair looks nice and clean.

On the top side of my cymbals, they are kind of a brown color with maybe a tint of orange. Some people say it is rust, but the cymbals contain no iron, so it can't be rust, but some kind of acid. And then where the pads are on the cymbal (around the strap on the cymbal) the stuff is kinda rubbed off, so you can see a little bit of its real color, and you can see the stuff on the bottom of the pad.

on the underside, they have some of the brown-orange acid or whatever it is, but it also has some clean and very shiny parts on it (unusually shiny).

Now HERE is a VERY interesting thing to keep in mind, that may help.

While playing at a football game, we set the cymbals on the floor of the bleachers, but someone spilled lemonade on the bleachers. So when we picked up the cymbals, the part the lemonade was touching is now clean, it removed the brown-orange "acid". However, it also left a purple line on it.

Any thoughts? How to clean it, what is on it? PLEASE I would be very thankful!