Beauty: I hope anyone will explain me……………?

FOLLOWING IS THE PROCESS OF PEDICURE.

1. remove any old nail polish
2. soak feet and warm bubbly water (could use any shower gels, bath gels, bubble bath)
3. wipe feet dry, trim nails, push back cuticles
4. apply an exfoliate to both of your feet and massage in focusing on the rough skin. (if you don't have any exfoliate try fine white sugar and a light moisturizer. combine 2 parts of sugar to 1 part moisturizer)
5. wash off exfoliate, dry feet and apply a deep moisturizer to your feet and legs is optional.

I have confusion in point 2 that can instead of shower gel , bath gel can i use shampoo in water???
I have confusion in point 3 that what does cuticle means and what does push back cuticle means???
I have confusion in point 4 that what is exfoliate ????