DIRTY LITTLE SECRET

I'm your dirty little secret that's used every day 
On the bath or sink us where I happen to lay 
A flannel or sponge keep me company it's true
Smelly products are also there including shampoo 

My shape is unusual and definitely not round 
Out of a packet is where I'm usually found 
Oil is the main ingredient of how I'm made 
In a steamy moment I am often mislaid 

I come in different colours and natural as well
Used in liquid form by the posher clientele 
Sometimes I'm tied on a sturdy old rope 
For I am dear friend your most humble soap