Help! Unpink my hair!

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I'm hoping to be saved from looking like an uber-woke university student by the wisdom of mumsnet:

I'm a bottle blonde. Technically, a bottle cool light blonde at the tips and natural dark blonde at the roots. The in-between transitions seamlessly and not entirely inexpensively.

Went to a local street festival yesterday where confetti are de rigeur. It also rained for a while. So I ended up with confetti dye in a variety of colours getting soaked into my hair.

Brushed all remnants of confetti out last night and shampooed and air dried. Woke up this morning to discover a plethora of faded looking but noticeable pink, blue and green stains on the bleached parts of my hair. Did the best I could by applying such copious amounts of dry shampoo that my actual hair closely resembles a barrister's wig at present.

Help! How do I unpink my hair? From the hairline up I look like a university student on a budget. It's not a good look.

Mix lemon juice with conditioner and apply like a hair mask, leave on for an hour or so and it should take the colour out. My hair is quite porous and it took the purple colour of my ash blonde hair dye, I looked like Marge Simpson! The lemon juice/ conditioner mix removed all the colour. Fingers crossed for you!

Head and shoulders should strip the unwanted colour.

Thanks, both!

Reading this: anything that will actually work is about to strip my ashy toner along with the pink and blue, isn't it?

Worth just making a salon appointment? I've only just been, actually.

Once you’ve tried the methods above just go heavy on a good purple shampoo for a few washes. Leave it in for a few minutes each time. That will bring back the ash tone.

Reading this: anything that will actually work is about to strip my ashy toner along with the pink and blue, isn't it?

It may strip your toner as well, but there's really no need for a salon appointment - very easy to do toner yourself (using professional products)!
My hair sounds very similar to yours colourwise and I use Wella Illumina 10/69 + Wella Colour Touch 1.9% (ration 1:2) to make the lighter bits a nice cool pearly blond. It's completely foolproof and great to freshen up your colour and take out any brassiness between salon visits. Much better than purple shampoo in my opinion.