I have used the big foot on a base and it didnt stain but in the book you get with the blender it says that rubbing a bit of oil onto the attachment should stop any staining, i dont know if this works, i use the big foot attachment every time i need to blend anything thats in a big pan. Have you tried the chopper bit yet, it does ginger and garlic in no time, one thing is when you come to clean the attachments dont get the "collar" bit wet, i just swill under hot water then wipe everything down with a sponge as soon as i have finished using it.