Introducing Piggies

Question
After one of my piggies died, I want to buy a new piggie, but i'm not sure how to introduce them to each other. One of them is just under 4 months old and the other one is 2 months old brand new from the pet store. I can't quarantine them either because my current guinea pig will get too depressed and will die (Which is what happen to my last piggie) so I am hoping that there is a way to introduce them fast?
The person at the pet store said we must spray them with this piggie deodrant to neutralise their scents but the bottle says - do not spray directly onto guinea pig... What can I put on them to neutralise their scents easily?

Answer
place them on neutral ground, ideally a run on a lawn, then have both in their cage or hutch with a mesh partition and keep swapping them over daily. after a few days it should be okay to remove the partition. you can also give them a bath, it is better to do it together and use a baby shampoo, this will work just as well (probably better) as any scent removing spray.