who sang

[barber]

who sang MILK in the 1990's

[Sproutstick]

Do you mean this one?:

I am milk
I am red hot kitchen
And I am cool
Cool as the deep blue ocean

If you do - it was sung by Garbage.  There is also one that was sung by Sumo called 'Milk' in the 90's (i think??) which could also be the one you are alluding to?

[sparklehorse]

'Tricky' also featuerd on the 'garbage' version of milk.