Dyed my hair the wrong colour, HELP

Hi, I've dyed my hair the wrong colour and I wonder if any of the hairdressers out there can give me some advice. I normally dye it red (at home) but stupidly went for a darker colour. My hair is now very dark (to me) at the ends and I don't think it suits me. What can I do? I have thought about going to a hairdresser to get some highlights to lighten the whole thing up, but will that work? I have long hair and lots of it and its thankfully very strong. How much would a colour correction cost me? Is there anything I can do at home to fade the colour (I know reds fade fast). A hairdresser once told me to wsh my hair with washing up detergent to strip the colour and another told me to use Head and Shoulders . Any suggestions greatly received.

My daughter recently done the same thing in the UK, unfortunately with an allergic reaction thrown in, the phoned a hairdresser who also told her to use washing up liquid,