Dog chewing on yellow tennis ball = yellow dye stain on carpet!!?

I just moved in a brand new rental house a few days ago, and I already have a carpet stain :( My dog was chewing on a tennis ball and the yellow dye came off onto the carpet. It's a fairly large mark. I have tried warm water + dishwashing soap and blotting it, but no luck. I am scared to try any "regular" cleaning products for fear of making it worse (since it is dye, not something like soda or dirt). Pleaaaase help!