I don't mind the smell and it will diminish considerably in the next 24-48 hours. I know some people add essential oils.  I don't wash my hair everyday so I usually wait 48 hours to wash the first time and you may still smell it after that. In terms of the mess, the indigo is the tough part since you did the cover the grey version. What a stained mess it made in my tub!! UGH! If you don't have a ton of grey you could use the regular version next time, see how that works. I also didn't have any issues rinsing, though I admit it's definitely harder than just rinsing shampoo!
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Glad you like the color! Post a pic? 






