AIO cloth diaper question

[MatalicPebble]

.....I have been wearing cloth diapers for a while now and learned a lot. Particularly how to wash them. I noticed how its better to pre-soak them to prevent oder stains. I also am looking into sewing my own generally because I can't always afford buying new ones when they wear out. It is a lot cheaper than disposables but spending so much at one time is not always feasible.
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.....My main question is why is it not advised to pre-soak them? (This is the note from the ebayer) Also will it be critical to use PUL over the common shower curtain? My drier is a big convenience to me but I am wondering about how the shower curtain material will handle.
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Note; I am still working on the other idea I had. More details in my blog posts.

 

[FishNut]

The problem with shower curtain is that it is not designed to have any weight or stretch on it - You will find it will destroy itself very quickly.
And leak - How are you going to seal the sides?
I tried with a plastic sheet for a bed :/