Steam cleaning is better for sure but only if whoever operates the machine is doing it properly and sucking up the excess water thoroughly and not rushing it like many carpet cleaners seem to do.
Dry cleaning from what I have seen just isn't able to penetrate deep into the carpet pile to remove all the dust and dirt like steam cleaning can. It will remove the stains for sure but as far as a thorough deep clean of the pile goes, I don't believe it can deliver that.
Steam doesn't harm nylon no. The only thing is with wool carpet you have to make sure you get out as much of the moisture as possible as the carpet can shrink and smell if it is left to dry too wet. You also have to be careful to suck up as much water as possible on any carpet because you don't want to get the underlay wet as that can take days to dry and it will smell for ages after.
Steam doesn't harm nylon no. The only thing is with wool carpet you have to make sure you get out as much of the moisture as possible as the carpet can shrink and smell if it is left to dry too wet. You also have to be careful to suck up as much water as possible on any carpet because you don't want to get the underlay wet as that can take days to dry and it will smell for ages after.
Good advice, Jay! How come I hate so much carpet cleaning?!
Dry or Steam cleaning?
who offers the best 
It's exhausting and always takes a lot of your spare time. 
Which makes me think about how can you clean a wallpaper actually?
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