anyone tried borax with MCN?

Has anyone tried using borax with MCNs? I was thinking of giving it a go, as it's a good natural stain remover, deodoriser and fabric softener, but I wanted to know if anyone else has tried it first and if anyone's had any experience of nappy rash, or build-up or other problems with it. It's been great so far on my flannelette flats, but I've not tried it on anything else yet. I don't have access to direct sunlight as a stain remover, sadly.
I have mostly pocket nappies and AIOs as drying time is a priority, but bubs is only 6 weeks old, so I'm still using mostly flanny flats and a cover at the moment. My stash is only just getting started, but what I do have is a mix of Berry Plush, Pocket Change, Itti bitti, Bum Genius, and a couple of Baby BeeHinds.
Any ideas?
Thanks in advance.

Haven't used it but you said it's a fabric softener so I would be avoiding it as it can reduce the absorbency of the nappies.

This is what I found on ozclothnappies:

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Some people choose bicarbonate of soda, borax, or vinegar to wash or rinse with, however this is not recommended by some nappy manufacturers: please check first, as sometimes these substances may cause wicking, stink or even destroy your elastic or PUL.

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I'd be checking with the manufactuers first as you wouldn't want to ruin any of your nappies.