HELP! removing that smell after colouring

It stays even after you've washed?  That's odd, because in my experience, the smell is usually gone pretty quickly if you rinse well enough.  Maybe your nose is sensitive, and you just smell it better than others?  Have you asked other people whether they smell it, too?

OK, this sounds totally weird but just go with it. There are a couple of products out there made for pulling scent out of hair-- one is a John Sebastian (I think that's the name of it) one that has a peach-like scent-- it's called Dry Clean Only. I use it after clubbing, when my hair stinks like cigarettes, and after I dye my hair. It works. The only drawback is that it makes my hair texture feel a little sticky, so I usually spray it on the day after dying, then put my hair up. Before bed, I give it another spray and in the morning, wash once, and voila! no more smell.

There are a couple of other products that do the same-- I think Aveda has one that's probably better on your hair but I don't know the name of it. Or there's the old Febreeze trick-- seriously, spray with a little diluted, unscented Febreeze. It sounds weird but it works.

I dye my blonde hair red (or I did, at least, and now I'm trying to reverse that, but that's a whole other story) and I wash it as little as I can get away with, because the red fades so fast. And when it grows out, the blonde roots make it look like I'm dying or something. It's scary :-) So the bad smell doesn't work, but neither does the idea of six shampoos, which, as you pointed out, is totally counter-productive. Anyway. :-) Hope that helps.