Yes, it works.
I purchased a new one this week and as I unwrapped it, I was trying to remember the original color. Wow, white. The other is my old dye grabber. I toss it in the wash with new clothing or fabric that may bleed. The dye grabber is effective for 30 washes and you can use the old cloth for cleaning or messy clean ups.
Free or almost free alert: specially marked packages offer up to $5 rebate. You cannot afford NOT to have a dye grabber.
(No, I have no ties with Carbona.)